NSF/ANSI 42
Aesthetic effects: chlorine, chloramine, taste, odour and particulates. The cartridge's activated carbon is certified to this standard.
Lab results
What the Duryn One takes out of tap water
Every figure on this page comes from an independent laboratory, tested against the protocol named next to it. We list what the cartridge is certified for, what it has been tested for, what is still in testing, and what it does not do.
NSF/ANSI 42
NSF/ANSI 53
NSF/ANSI 401
NSF/ANSI/CAN 372
EN 17093
EC 1935/2004 · LFGB
- Product tested
- Duryn One gravity water filter pitcher, 2.7 L (11 cups)
- Cartridge
- Clean cartridge; current model details are listed on the product page
- Rated capacity
- See the current product specification
- Laboratories
- Independent laboratory details are provided with each published report
- Protocols
- NSF/ANSI 42, 53, 401 and 372; EN 17093 and EC 1935/2004 / LFGB in progress
- Testing completed
- See the publication date on each report
- Sold by
- Salvi Line Ltd (UK) EU: Turquoisereach Unipessoal LDA
Certifications and standards
A certification means an accredited body has tested the product and lists it publicly. A lab test to the same protocol produces the same data without the listing. We say which is which.
NSF/ANSI/CAN 372
Lead content. Confirms that no part touching the water contains more than 0.25% lead by weighted average. Duryn's wetted parts are glass, 304 steel and silicone.
NSF/ANSI 53
Health effects: lead, mercury, PFOA/PFOS, VOCs, cysts and other contaminants with a health limit. Tested to the protocol by IAPMO R&T; figures in the table below.
NSF/ANSI 401
Emerging compounds: pharmaceuticals, hormones, flame retardants, pesticides and microplastics of 0.5 to 1 µm.
EN 17093
The European standard for jug water filters: hardness and chlorine reduction, lead and copper, service life, and that nothing migrates from the materials into the water.
EC 1935/2004 and LFGB
EU and German food-contact rules for the glass, steel and silicone. Confirms the materials are safe to hold water and food.
Top searches:
Certified listed by NSF International or IAPMO R&T against the standard
Lab-tested ISO/IEC 17025 laboratory, NSF/ANSI protocol, no listing
Not published no public result is currently displayed for this row
Not claimed the Duryn One does not claim reduction
Nothing matches that search. Try the chemical's abbreviation (PFOA, TCE, THM) or its family name.
Values marked “Not published” can be added in the Theme Editor when verified reports are ready.
PFAS (forever chemicals)
Fluorinated compounds from non-stick coatings, packaging and firefighting foam. They do not break down in the environment and accumulate in the body.
32 contaminants
| Contaminant | Protocol | Challenge water | Filtered water | Reduction | Health concern |
|---|---|---|---|---|---|
| PFOA Perfluorooctanoic acid | NSF/ANSI 53 | 485ppt | <5ppt | 98.99% | Cancer (IARC Group 1); immune and developmental effects |
| PFOS Perfluorooctane sulfonic acid | NSF/ANSI 53 | 985ppt | <5ppt | 99.49% | Possibly carcinogenic (IARC 2B); immune and developmental effects |
| PFNA Perfluorononanoic acid | ISO 17025 lab test | 56.6 ppt | <5ppt | 99.9% | Persistent; immune, liver and developmental effects under study |
| PFHxS Perfluorohexane sulfonic acid | ISO 17025 lab test | 354.4ppt | <5ppt | 98.58% | Persistent; immune, liver and developmental effects under study |
| PFHpA Perfluoroheptanoic acid | ISO 17025 lab test | 40.3ppt | <5ppt | 99.89% | Persistent; immune, liver and developmental effects under study |
| PFBS Perfluorobutane sulfonic acid | ISO 17025 lab test | 273.01ppt | <5ppt | 99.99% | Persistent; immune, liver and developmental effects under study |
| PFBA Perfluorobutanoic acid | ISO 17025 lab test | Not published | Not published | Test Pending | Persistent; immune, liver and developmental effects under study |
| PFPeA Perfluoropentanoic acid | ISO 17025 lab test | Not published | Not published | Test Pending | Persistent; immune, liver and developmental effects under study |
| PFHxA Perfluorohexanoic acid | ISO 17025 lab test | Not published | Not published | Test Pending | Persistent; immune, liver and developmental effects under study |
| PFDA Perfluorodecanoic acid | ISO 17025 lab test | 8.21ppt | 0.01ppt | 99% | Persistent; immune, liver and developmental effects under study |
| PFUnDA Perfluoroundecanoic acid, PFUnA | ISO 17025 lab test | Not published | Not published | Not published | Persistent; immune, liver and developmental effects under study |
| PFDoDA Perfluorododecanoic acid, PFDoA | ISO 17025 lab test | Not published | Not published | Not published | Persistent; immune, liver and developmental effects under study |
| PFTrDA Perfluorotridecanoic acid | ISO 17025 lab test | Not published | Not published | Not published | Persistent; immune, liver and developmental effects under study |
| PFTeDA Perfluorotetradecanoic acid | ISO 17025 lab test | Not published | Not published | Not published | Persistent; immune, liver and developmental effects under study |
| PFPeS Perfluoropentane sulfonic acid | ISO 17025 lab test | Not published | Not published | Not published | Persistent; immune, liver and developmental effects under study |
| PFHpS Perfluoroheptane sulfonic acid | ISO 17025 lab test | Not published | Not published | Not published | Persistent; immune, liver and developmental effects under study |
| PFDS Perfluorodecane sulfonic acid | ISO 17025 lab test | Not published | Not published | Not published | Persistent; immune, liver and developmental effects under study |
| HFPO-DA (GenX) Hexafluoropropylene oxide dimer acid | ISO 17025 lab test | Not published | Not published | Not published | Liver, kidney and immune effects |
| ADONA 4,8-Dioxa-3H-perfluorononanoic acid | ISO 17025 lab test | Not published | Not published | Not published | Persistent; immune, liver and developmental effects under study |
| 9Cl-PF3ONS F-53B major component | ISO 17025 lab test | Not published | Not published | Not published | Persistent; immune, liver and developmental effects under study |
| 11Cl-PF3OUdS F-53B minor component | ISO 17025 lab test | Not published | Not published | Not published | Persistent; immune, liver and developmental effects under study |
| NEtFOSAA N-ethyl perfluorooctane sulfonamidoacetic acid | ISO 17025 lab test | Not published | Not published | Not published | Persistent; immune, liver and developmental effects under study |
| NMeFOSAA N-methyl perfluorooctane sulfonamidoacetic acid | ISO 17025 lab test | Not published | Not published | Not published | Persistent; immune, liver and developmental effects under study |
| PFOSA (FOSA) Perfluorooctane sulfonamide | ISO 17025 lab test | Not published | Not published | Not published | Persistent; immune, liver and developmental effects under study |
| 4:2 FTS Fluorotelomer sulfonic acid 4:2 | ISO 17025 lab test | Not published | Not published | Not published | Persistent; immune, liver and developmental effects under study |
| 6:2 FTS Fluorotelomer sulfonic acid 6:2 | ISO 17025 lab test | Not published | Not published | Not published | Persistent; immune, liver and developmental effects under study |
| 8:2 FTS Fluorotelomer sulfonic acid 8:2 | ISO 17025 lab test | Not published | Not published | Not published | Persistent; immune, liver and developmental effects under study |
| PFMPA Perfluoro-3-methoxypropanoic acid | ISO 17025 lab test | Not published | Not published | Not published | Persistent; immune, liver and developmental effects under study |
| PFMBA Perfluoro-4-methoxybutanoic acid | ISO 17025 lab test | Not published | Not published | Not published | Persistent; immune, liver and developmental effects under study |
| NFDHA Nonafluoro-3,6-dioxaheptanoic acid | ISO 17025 lab test | Not published | Not published | Not published | Persistent; immune, liver and developmental effects under study |
| PFEESA Perfluoro(2-ethoxyethane)sulfonic acid | ISO 17025 lab test | Not published | Not published | Not published | Persistent; immune, liver and developmental effects under study |
| Total PFAS Sum of EPA Method 533 analytes | ISO 17025 lab test | Not published | Not published | Not published | Combined exposure; EU Drinking Water Directive sets a sum-of-PFAS limit |
Heavy metals & inorganics
Lead from old pipes and solder, arsenic and chromium from rock and industry. Toxic at trace levels; several accumulate over years.
27 contaminants
| Contaminant | Protocol | Challenge water | Filtered water | Reduction | Health concern |
|---|---|---|---|---|---|
| Lead Pb | NSF/ANSI 53 | Not published | Not published | Not published | Neurodevelopmental harm in children; kidney and blood-pressure effects |
| Mercury (inorganic) Hg | NSF/ANSI 53 | Not published | Not published | Not published | Kidney and nervous-system damage |
| Arsenic (pentavalent, As V) Arsenate | NSF/ANSI 53 | Not published | Not published | Not published | Cancer; skin, cardiovascular and developmental effects |
| Arsenic (trivalent, As III) Arsenite | NSF/ANSI 53 | Not published | Not published | Not published | Cancer; skin, cardiovascular and developmental effects |
| Cadmium Cd | NSF/ANSI 53 | Not published | Not published | Not published | Kidney damage; bone density loss |
| Chromium (hexavalent, Cr VI) Chromium-6 | NSF/ANSI 53 | Not published | Not published | Not published | Cancer; stomach and intestinal effects |
| Chromium (trivalent, Cr III) Chromium-3 | NSF/ANSI 53 | Not published | Not published | Not published | Skin irritation at high levels |
| Copper Cu | NSF/ANSI 53 | Not published | Not published | Not published | Stomach upset; liver and kidney effects with long exposure |
| Barium Ba | NSF/ANSI 53 | Not published | Not published | Not published | Raised blood pressure |
| Selenium Se | NSF/ANSI 53 | Not published | Not published | Not published | Hair and nail loss; circulatory effects |
| Antimony Sb | ISO 17025 lab test | Not published | Not published | Not published | Raised blood cholesterol; lowered blood sugar |
| Beryllium Be | ISO 17025 lab test | Not published | Not published | Not published | Intestinal lesions |
| Thallium Tl | ISO 17025 lab test | Not published | Not published | Not published | Hair loss; blood, kidney and nerve effects |
| Nickel Ni | ISO 17025 lab test | Not published | Not published | Not published | Allergic reaction; kidney effects |
| Aluminium Al, aluminum | ISO 17025 lab test | Not published | Not published | Not published | Neurological effects under study |
| Cobalt Co | ISO 17025 lab test | Not published | Not published | Not published | Heart and thyroid effects at high doses |
| Molybdenum Mo | ISO 17025 lab test | Not published | Not published | Not published | Gout-like symptoms at high doses |
| Vanadium V | ISO 17025 lab test | Not published | Not published | Not published | Kidney and developmental effects under study |
| Silver Ag | ISO 17025 lab test | Not published | Not published | Not published | Skin discolouration (argyria) |
| Strontium Sr | ISO 17025 lab test | Not published | Not published | Not published | Bone development effects in children |
| Lithium Li | ISO 17025 lab test | Not published | Not published | Not published | Thyroid and kidney effects at high levels |
| Tin Sn | ISO 17025 lab test | Not published | Not published | Not published | Stomach irritation |
| Boron B | ISO 17025 lab test | Not published | Not published | Not published | Reproductive and developmental effects |
| Cyanide CN | ISO 17025 lab test | Not published | Not published | Not published | Nerve and thyroid effects |
| Zinc Zn | NSF/ANSI 42 | Not published | Not published | Not published | Metallic taste; stomach upset |
| Iron Fe, rust | NSF/ANSI 42 | Not published | Not published | Not published | Staining, metallic taste |
| Manganese Mn | NSF/ANSI 42 | Not published | Not published | Not published | Nervous-system effects in infants at high levels; staining |
Disinfectants & by-products
The chlorine or chloramine that keeps tap water safe on its way to you, and the compounds that form when it reacts with organic matter in the pipes.
29 contaminants
| Contaminant | Protocol | Challenge water | Filtered water | Reduction | Health concern |
|---|---|---|---|---|---|
| Chlorine (free) Cl2, hypochlorite | NSF/ANSI 42 | 2.1ppm | 0.01ppm | 99.999% | Taste and odour; skin and eye irritation |
| Chloramine Monochloramine | NSF/ANSI 42 | Not published | Not published | Not published | Taste and odour; irritation; harmful to dialysis patients and fish |
| Chlorine taste & odour Aesthetic | NSF/ANSI 42 | Not published | Not published | Certified NSF | Taste and odour |
| Total trihalomethanes (TTHM) THMs | NSF/ANSI 53 | Not published | Not published | Not published | Cancer; liver, kidney and nervous-system effects |
| Chloroform Trichloromethane | NSF/ANSI 53 | Not published | Not published | Not published | Cancer; liver and kidney effects |
| Bromoform Tribromomethane | NSF/ANSI 53 | Not published | Not published | Not published | Cancer; liver and kidney effects |
| Bromodichloromethane BDCM | NSF/ANSI 53 | Not published | Not published | Not published | Cancer; liver and kidney effects |
| Dibromochloromethane DBCM, chlorodibromomethane | NSF/ANSI 53 | Not published | Not published | Not published | Cancer; liver and kidney effects |
| Haloacetic acids (HAA5) HAAs | NSF/ANSI 53 | Not published | Not published | Not published | Cancer; developmental effects |
| Monochloroacetic acid MCAA | NSF/ANSI 53 | Not published | Not published | Not published | Cancer |
| Dichloroacetic acid DCAA | NSF/ANSI 53 | Not published | Not published | Not published | Cancer |
| Trichloroacetic acid TCAA | NSF/ANSI 53 | Not published | Not published | Not published | Cancer |
| Monobromoacetic acid MBAA | NSF/ANSI 53 | Not published | Not published | Not published | Cancer |
| Dibromoacetic acid DBAA | NSF/ANSI 53 | Not published | Not published | Not published | Cancer |
| Tribromoacetic acid TBAA | NSF/ANSI 53 | Not published | Not published | Not published | Cancer |
| Bromochloroacetic acid BCAA | ISO 17025 lab test | Not published | Not published | Not published | Cancer |
| Chlorate ClO3 | ISO 17025 lab test | Not published | Not published | Not published | Thyroid effects; oxidative damage to red blood cells |
| Chlorite ClO2 | ISO 17025 lab test | Not published | Not published | Not published | Anaemia; nervous-system effects in infants |
| Bromate BrO3 | ISO 17025 lab test | Not published | Not published | Not published | Cancer |
| Bromochloroacetonitrile Haloacetonitrile | NSF/ANSI 53 | Not published | Not published | Not published | Cancer suspected |
| Dibromoacetonitrile Haloacetonitrile | NSF/ANSI 53 | Not published | Not published | Not published | Cancer suspected |
| Dichloroacetonitrile Haloacetonitrile | NSF/ANSI 53 | Not published | Not published | Not published | Cancer suspected |
| Trichloroacetonitrile Haloacetonitrile | NSF/ANSI 53 | Not published | Not published | Not published | Cancer suspected |
| 1,1-Dichloro-2-propanone Haloketone | NSF/ANSI 53 | Not published | Not published | Not published | Mutagenic in tests |
| 1,1,1-Trichloro-2-propanone Haloketone | NSF/ANSI 53 | Not published | Not published | Not published | Mutagenic in tests |
| Chloropicrin Trichloronitromethane | NSF/ANSI 53 | Not published | Not published | Not published | Eye and lung irritation |
| Chloral hydrate Trichloroacetaldehyde | ISO 17025 lab test | Not published | Not published | Not published | Liver effects |
| NDMA N-nitrosodimethylamine | ISO 17025 lab test | Not published | Not published | Not published | Cancer |
| Formaldehyde Methanal | ISO 17025 lab test | Not published | Not published | Not published | Cancer |
VOCs & industrial solvents
Fuel, solvent and dry-cleaning chemicals that reach groundwater from spills, landfills and industrial sites.
48 contaminants
| Contaminant | Protocol | Challenge water | Filtered water | Reduction | Health concern |
|---|---|---|---|---|---|
| Benzene | NSF/ANSI 53 | Not published | Not published | Not published | Cancer (leukaemia); anaemia |
| Toluene Methylbenzene | NSF/ANSI 53 | Not published | Not published | Not published | Nervous system, kidney and liver effects |
| Ethylbenzene | NSF/ANSI 53 | Not published | Not published | Not published | Liver and kidney effects |
| Xylenes (total) o-, m-, p-xylene | NSF/ANSI 53 | Not published | Not published | Not published | Nervous-system effects |
| Styrene Vinylbenzene | NSF/ANSI 53 | Not published | Not published | Not published | Liver, kidney and circulatory effects |
| Carbon tetrachloride Tetrachloromethane | NSF/ANSI 53 | Not published | Not published | Not published | Cancer; liver effects |
| Chlorobenzene Monochlorobenzene | NSF/ANSI 53 | Not published | Not published | Not published | Liver and kidney effects |
| 1,2-Dichlorobenzene o-Dichlorobenzene | NSF/ANSI 53 | Not published | Not published | Not published | Liver, kidney and circulatory effects |
| 1,4-Dichlorobenzene p-Dichlorobenzene | NSF/ANSI 53 | Not published | Not published | Not published | Anaemia; liver and kidney effects |
| 1,3-Dichlorobenzene m-Dichlorobenzene | ISO 17025 lab test | Not published | Not published | Not published | Nervous-system effects |
| 1,2,4-Trichlorobenzene | NSF/ANSI 53 | Not published | Not published | Not published | Adrenal gland effects |
| 1,2-Dichloroethane Ethylene dichloride | NSF/ANSI 53 | Not published | Not published | Not published | Cancer |
| 1,1-Dichloroethane | ISO 17025 lab test | Not published | Not published | Not published | Cancer suspected |
| 1,1-Dichloroethylene Vinylidene chloride | NSF/ANSI 53 | Not published | Not published | Not published | Liver effects |
| cis-1,2-Dichloroethylene | NSF/ANSI 53 | Not published | Not published | Not published | Liver effects |
| trans-1,2-Dichloroethylene | NSF/ANSI 53 | Not published | Not published | Not published | Liver effects |
| 1,2-Dichloropropane Propylene dichloride | NSF/ANSI 53 | Not published | Not published | Not published | Cancer |
| cis-1,3-Dichloropropene | NSF/ANSI 53 | Not published | Not published | Not published | Cancer |
| trans-1,3-Dichloropropene | ISO 17025 lab test | Not published | Not published | Not published | Cancer |
| Tetrachloroethylene (PCE) Perchloroethylene, dry-cleaning solvent | NSF/ANSI 53 | Not published | Not published | Not published | Cancer; liver effects |
| Trichloroethylene (TCE) | NSF/ANSI 53 | Not published | Not published | Not published | Cancer; liver effects |
| 1,1,1-Trichloroethane Methyl chloroform | NSF/ANSI 53 | Not published | Not published | Not published | Liver, nervous-system and circulatory effects |
| 1,1,2-Trichloroethane | NSF/ANSI 53 | Not published | Not published | Not published | Liver, kidney and immune effects |
| 1,1,2,2-Tetrachloroethane | NSF/ANSI 53 | Not published | Not published | Not published | Cancer; liver effects |
| 1,1,1,2-Tetrachloroethane | ISO 17025 lab test | Not published | Not published | Not published | Cancer suspected |
| Hexachlorobutadiene | NSF/ANSI 53 | Not published | Not published | Not published | Kidney effects; cancer suspected |
| Hexachlorocyclopentadiene | NSF/ANSI 53 | Not published | Not published | Not published | Kidney and stomach effects |
| MTBE Methyl tert-butyl ether | NSF/ANSI 53 | Not published | Not published | Not published | Taste and odour; cancer suspected |
| Vinyl chloride Chloroethene | ISO 17025 lab test | Not published | Not published | Not published | Cancer |
| Dichloromethane Methylene chloride | ISO 17025 lab test | Not published | Not published | Not published | Cancer; liver effects |
| 1,4-Dioxane | ISO 17025 lab test | Not published | Not published | Not published | Cancer |
| Naphthalene | ISO 17025 lab test | Not published | Not published | Not published | Anaemia; cancer suspected |
| Isopropylbenzene (cumene) | ISO 17025 lab test | Not published | Not published | Not published | Kidney and nervous-system effects |
| 1,2,3-Trichloropropane TCP | ISO 17025 lab test | Not published | Not published | Not published | Cancer |
| Ethylene dibromide (EDB) 1,2-Dibromoethane | NSF/ANSI 53 | Not published | Not published | Not published | Cancer; reproductive effects |
| 1,2-Dibromo-3-chloropropane (DBCP) | NSF/ANSI 53 | Not published | Not published | Not published | Cancer; reproductive effects |
| Methyl ethyl ketone 2-Butanone, MEK | ISO 17025 lab test | Not published | Not published | Not published | Nervous-system effects |
| Acetone Propanone | ISO 17025 lab test | Not published | Not published | Not published | Nervous-system effects at high levels |
| Chloroethane Ethyl chloride | ISO 17025 lab test | Not published | Not published | Not published | Nervous-system effects |
| Bromobenzene | ISO 17025 lab test | Not published | Not published | Not published | Liver effects |
| 1,2,4-Trimethylbenzene | ISO 17025 lab test | Not published | Not published | Not published | Nervous-system and blood effects |
| 1,3,5-Trimethylbenzene | ISO 17025 lab test | Not published | Not published | Not published | Nervous-system effects |
| n-Butylbenzene | ISO 17025 lab test | Not published | Not published | Not published | Nervous-system effects |
| Chloromethane Methyl chloride | ISO 17025 lab test | Not published | Not published | Not published | Nervous-system and liver effects |
| Bromomethane Methyl bromide | ISO 17025 lab test | Not published | Not published | Not published | Nervous-system effects |
| Trichlorofluoromethane CFC-11 | ISO 17025 lab test | Not published | Not published | Not published | Heart and liver effects |
| Dichlorodifluoromethane CFC-12 | ISO 17025 lab test | Not published | Not published | Not published | Heart and liver effects |
| Carbon disulfide | ISO 17025 lab test | Not published | Not published | Not published | Nervous-system and reproductive effects |
Pesticides & herbicides
Farm and garden chemicals carried into rivers and aquifers by run-off. The list includes the compounds most often found in EU and US supplies.
50 contaminants
| Contaminant | Protocol | Challenge water | Filtered water | Reduction | Health concern |
|---|---|---|---|---|---|
| Atrazine Triazine herbicide | NSF/ANSI 53 | Not published | Not published | Not published | Hormone disruption; reproductive effects |
| Simazine Triazine herbicide | NSF/ANSI 53 | Not published | Not published | Not published | Hormone disruption; blood effects |
| Alachlor Lasso | NSF/ANSI 53 | Not published | Not published | Not published | Cancer; eye, liver and kidney effects |
| Metolachlor Dual | NSF/ANSI 401 | Not published | Not published | Not published | Cancer suspected |
| Linuron Urea herbicide | NSF/ANSI 401 | Not published | Not published | Not published | Hormone disruption |
| Carbofuran Furadan | NSF/ANSI 53 | Not published | Not published | Not published | Nervous-system and reproductive effects |
| 2,4-D 2,4-Dichlorophenoxyacetic acid | NSF/ANSI 53 | Not published | Not published | Not published | Liver, kidney and adrenal effects |
| 2,4,5-TP (Silvex) Fenoprop | NSF/ANSI 53 | Not published | Not published | Not published | Liver effects |
| Dinoseb | NSF/ANSI 53 | Not published | Not published | Not published | Reproductive and developmental effects |
| Endrin Organochlorine | NSF/ANSI 53 | Not published | Not published | Not published | Liver and nervous-system effects |
| Heptachlor Organochlorine | NSF/ANSI 53 | Not published | Not published | Not published | Cancer; liver effects |
| Heptachlor epoxide | NSF/ANSI 53 | Not published | Not published | Not published | Cancer; liver effects |
| Lindane gamma-HCH | NSF/ANSI 53 | Not published | Not published | Not published | Cancer; liver and kidney effects |
| Methoxychlor | NSF/ANSI 53 | Not published | Not published | Not published | Hormone disruption; reproductive effects |
| Pentachlorophenol PCP | NSF/ANSI 53 | Not published | Not published | Not published | Cancer; liver and kidney effects |
| Chlordane Organochlorine | NSF/ANSI 53 | Not published | Not published | Not published | Cancer; liver and nervous-system effects |
| Toxaphene Organochlorine | NSF/ANSI 53 | Not published | Not published | Not published | Cancer; kidney, liver and thyroid effects |
| Glyphosate Roundup | ISO 17025 lab test | Not published | Not published | Not published | Kidney effects; cancer classification disputed |
| AMPA Glyphosate degradate | ISO 17025 lab test | Not published | Not published | Not published | See compound |
| Dieldrin Organochlorine | ISO 17025 lab test | Not published | Not published | Not published | Cancer; nervous-system effects |
| Aldrin Organochlorine | ISO 17025 lab test | Not published | Not published | Not published | Cancer; nervous-system effects |
| DDT p,p'-DDT | ISO 17025 lab test | Not published | Not published | Not published | Cancer; hormone disruption |
| DDE DDT degradate | ISO 17025 lab test | Not published | Not published | Not published | Hormone disruption |
| DDD DDT degradate | ISO 17025 lab test | Not published | Not published | Not published | Cancer suspected |
| Chlorpyrifos Organophosphate | ISO 17025 lab test | Not published | Not published | Not published | Neurodevelopmental effects |
| Diazinon Organophosphate | ISO 17025 lab test | Not published | Not published | Not published | Nervous-system effects |
| Malathion Organophosphate | ISO 17025 lab test | Not published | Not published | Not published | Nervous-system effects |
| Dicamba | ISO 17025 lab test | Not published | Not published | Not published | Nervous-system effects |
| MCPA Phenoxy herbicide | ISO 17025 lab test | Not published | Not published | Not published | Kidney and liver effects |
| Mecoprop (MCPP) Phenoxy herbicide | ISO 17025 lab test | Not published | Not published | Not published | Kidney and liver effects |
| Bentazone Basagran | ISO 17025 lab test | Not published | Not published | Not published | Blood and kidney effects |
| Metazachlor | ISO 17025 lab test | Not published | Not published | Not published | Liver effects |
| Terbuthylazine Triazine herbicide | ISO 17025 lab test | Not published | Not published | Not published | Liver and blood effects |
| Isoproturon Urea herbicide | ISO 17025 lab test | Not published | Not published | Not published | Cancer suspected |
| Diuron Urea herbicide | ISO 17025 lab test | Not published | Not published | Not published | Cancer suspected; blood effects |
| Chlorotoluron Urea herbicide | ISO 17025 lab test | Not published | Not published | Not published | Cancer suspected |
| Propazine Triazine herbicide | ISO 17025 lab test | Not published | Not published | Not published | Hormone disruption |
| Cyanazine Triazine herbicide | ISO 17025 lab test | Not published | Not published | Not published | Developmental effects |
| Desethylatrazine Atrazine degradate | ISO 17025 lab test | Not published | Not published | Not published | Hormone disruption |
| Metribuzin | ISO 17025 lab test | Not published | Not published | Not published | Liver and thyroid effects |
| Acetochlor | ISO 17025 lab test | Not published | Not published | Not published | Cancer suspected |
| Dacthal (DCPA) | ISO 17025 lab test | Not published | Not published | Not published | Thyroid and developmental effects |
| Picloram | ISO 17025 lab test | Not published | Not published | Not published | Liver effects |
| Paraquat | ISO 17025 lab test | Not published | Not published | Not published | Lung and nervous-system effects |
| Diquat | ISO 17025 lab test | Not published | Not published | Not published | Cataracts |
| Endothall | ISO 17025 lab test | Not published | Not published | Not published | Stomach and intestinal effects |
| Oxamyl Vydate | ISO 17025 lab test | Not published | Not published | Not published | Nervous-system effects |
| Aldicarb Temik | ISO 17025 lab test | Not published | Not published | Not published | Nervous-system effects |
| Carbaryl Sevin | ISO 17025 lab test | Not published | Not published | Not published | Nervous-system effects; cancer suspected |
| Imidacloprid Neonicotinoid | ISO 17025 lab test | Not published | Not published | Not published | Nervous-system effects under study |
Pesticides & herbicides — continued
Additional results in this category.
10 contaminants
| Contaminant | Protocol | Challenge water | Filtered water | Reduction | Health concern |
|---|---|---|---|---|---|
| Thiamethoxam Neonicotinoid | ISO 17025 lab test | Not published | Not published | Not published | Liver effects; cancer suspected |
| Clothianidin Neonicotinoid | ISO 17025 lab test | Not published | Not published | Not published | Reproductive effects under study |
| Fipronil | ISO 17025 lab test | Not published | Not published | Not published | Thyroid and nervous-system effects |
| Boscalid Fungicide | ISO 17025 lab test | Not published | Not published | Not published | Thyroid and liver effects |
| Tebuconazole Fungicide | ISO 17025 lab test | Not published | Not published | Not published | Liver effects; developmental effects |
| Propiconazole Fungicide | ISO 17025 lab test | Not published | Not published | Not published | Liver effects |
| Trifluralin | ISO 17025 lab test | Not published | Not published | Not published | Cancer suspected |
| Hexachlorobenzene HCB | ISO 17025 lab test | Not published | Not published | Not published | Cancer; liver and reproductive effects |
| PCBs Polychlorinated biphenyls | ISO 17025 lab test | Not published | Not published | Not published | Cancer; immune, reproductive and nervous-system effects |
| 2,3,7,8-TCDD (dioxin) | ISO 17025 lab test | Not published | Not published | Not published | Cancer; reproductive and immune effects |
Pharmaceuticals & hormones
Medicines and hormones that pass through people, and through wastewater treatment, into drinking-water sources at trace levels.
30 contaminants
| Contaminant | Protocol | Challenge water | Filtered water | Reduction | Health concern |
|---|---|---|---|---|---|
| Meprobamate Anxiolytic | NSF/ANSI 401 | Not published | Not published | Not published | Trace-level exposure; long-term effects under study |
| Phenytoin Anti-epileptic | NSF/ANSI 401 | Not published | Not published | Not published | Trace-level exposure; long-term effects under study |
| Atenolol Beta blocker | NSF/ANSI 401 | Not published | Not published | Not published | Trace-level exposure; long-term effects under study |
| Carbamazepine Anti-epileptic | NSF/ANSI 401 | Not published | Not published | Not published | Trace-level exposure; long-term effects under study |
| TCEP Tris(2-chloroethyl) phosphate, flame retardant | NSF/ANSI 401 | Not published | Not published | Not published | Cancer suspected; kidney effects |
| TCPP Tris(1-chloro-2-propyl) phosphate, flame retardant | NSF/ANSI 401 | Not published | Not published | Not published | Cancer suspected |
| DEET Insect repellent | NSF/ANSI 401 | Not published | Not published | Not published | Nervous-system effects at high doses |
| Trimethoprim Antibiotic | NSF/ANSI 401 | Not published | Not published | Not published | Antibiotic resistance |
| Ibuprofen NSAID | NSF/ANSI 401 | Not published | Not published | Not published | Trace-level exposure; long-term effects under study |
| Naproxen NSAID | NSF/ANSI 401 | Not published | Not published | Not published | Trace-level exposure; long-term effects under study |
| Estrone Hormone | NSF/ANSI 401 | Not published | Not published | Not published | Hormone disruption |
| Paracetamol (acetaminophen) | ISO 17025 lab test | Not published | Not published | Not published | Trace-level exposure; long-term effects under study |
| Caffeine | ISO 17025 lab test | Not published | Not published | Not published | Trace-level exposure; long-term effects under study |
| Diclofenac NSAID | ISO 17025 lab test | Not published | Not published | Not published | Kidney effects; toxic to aquatic life |
| Sulfamethoxazole Antibiotic | ISO 17025 lab test | Not published | Not published | Not published | Antibiotic resistance |
| Ciprofloxacin Antibiotic | ISO 17025 lab test | Not published | Not published | Not published | Antibiotic resistance |
| Erythromycin Antibiotic | ISO 17025 lab test | Not published | Not published | Not published | Antibiotic resistance |
| Fluoxetine Antidepressant (SSRI) | ISO 17025 lab test | Not published | Not published | Not published | Trace-level exposure; long-term effects under study |
| Gemfibrozil Lipid regulator | ISO 17025 lab test | Not published | Not published | Not published | Trace-level exposure; long-term effects under study |
| Primidone Anti-epileptic | ISO 17025 lab test | Not published | Not published | Not published | Trace-level exposure; long-term effects under study |
| Metformin Diabetes medicine | ISO 17025 lab test | Not published | Not published | Not published | Trace-level exposure; long-term effects under study |
| Metoprolol Beta blocker | ISO 17025 lab test | Not published | Not published | Not published | Trace-level exposure; long-term effects under study |
| 17β-Estradiol Hormone | ISO 17025 lab test | Not published | Not published | Not published | Hormone disruption |
| 17α-Ethinylestradiol Contraceptive hormone | ISO 17025 lab test | Not published | Not published | Not published | Hormone disruption |
| Estriol Hormone | ISO 17025 lab test | Not published | Not published | Not published | Hormone disruption |
| Testosterone Hormone | ISO 17025 lab test | Not published | Not published | Not published | Hormone disruption |
| Progesterone Hormone | ISO 17025 lab test | Not published | Not published | Not published | Hormone disruption |
| Triclosan Antibacterial agent | ISO 17025 lab test | Not published | Not published | Not published | Hormone disruption; antibiotic resistance |
| Iopromide X-ray contrast agent | ISO 17025 lab test | Not published | Not published | Not published | Trace-level exposure; long-term effects under study |
| Sucralose Artificial sweetener | ISO 17025 lab test | Not published | Not published | Not published | Trace-level exposure; long-term effects under study |
Microplastics, particulates & plasticisers
Plastic particles, the additives that leach out of plastics, and the sediment and rust that cloud water.
16 contaminants
| Contaminant | Protocol | Challenge water | Filtered water | Reduction | Health concern |
|---|---|---|---|---|---|
| Microplastics (0.5–1 µm) Plastic particles | NSF/ANSI 401 | Not published | Not published | Not published | Chronic exposure effects under study; carrier for other chemicals |
| Particulates, Class I (0.5 to <1 µm) Fine sediment | NSF/ANSI 42 | Not published | Not published | Not published | Cloudy water; carrier for other contaminants |
| Turbidity Cloudiness | NSF/ANSI 53 | Not published | Not published | Not published | Shields microbes from disinfection |
| Asbestos Fibres from cement pipes | NSF/ANSI 53 | Not published | Not published | Not published | Cancer (intestinal polyps) |
| Bisphenol A (BPA) | NSF/ANSI 401 | Not published | Not published | Not published | Hormone disruption |
| Bisphenol S (BPS) BPA substitute | ISO 17025 lab test | Not published | Not published | Not published | Hormone disruption |
| Bisphenol F (BPF) BPA substitute | ISO 17025 lab test | Not published | Not published | Not published | Hormone disruption |
| Nonylphenol Surfactant degradate | NSF/ANSI 401 | Not published | Not published | Not published | Hormone disruption |
| 4-tert-Octylphenol | ISO 17025 lab test | Not published | Not published | Not published | Hormone disruption |
| DEHP Di(2-ethylhexyl) phthalate | ISO 17025 lab test | Not published | Not published | Not published | Cancer; reproductive and developmental effects |
| DBP Di-n-butyl phthalate | ISO 17025 lab test | Not published | Not published | Not published | Reproductive and developmental effects |
| BBP Butyl benzyl phthalate | ISO 17025 lab test | Not published | Not published | Not published | Reproductive and developmental effects |
| DEP Diethyl phthalate | ISO 17025 lab test | Not published | Not published | Not published | Reproductive effects |
| DMP Dimethyl phthalate | ISO 17025 lab test | Not published | Not published | Not published | Hormone disruption |
| DiBP Diisobutyl phthalate | ISO 17025 lab test | Not published | Not published | Not published | Reproductive and developmental effects |
| DnOP Di-n-octyl phthalate | ISO 17025 lab test | Not published | Not published | Not published | Hormone disruption |
Radiological
Naturally occurring radioactive elements dissolved from rock into groundwater.
4 contaminants
| Contaminant | Protocol | Challenge water | Filtered water | Reduction | Health concern |
|---|---|---|---|---|---|
| Radium 226/228 Ra | NSF/ANSI 53 | Not published | Not published | Not published | Cancer (bone) |
| Uranium U | NSF/ANSI 53 | Not published | Not published | Not published | Kidney effects; cancer |
| Gross alpha Alpha emitters | ISO 17025 lab test | Not published | Not published | Not published | Cancer |
| Gross beta Beta emitters | ISO 17025 lab test | Not published | Not published | Not published | Cancer |
Microbiological
Cysts, bacteria and viruses. A gravity pitcher is not a purifier; see what we do not claim below.
3 contaminants
| Contaminant | Protocol | Challenge water | Filtered water | Reduction | Health concern |
|---|---|---|---|---|---|
| Cysts (Cryptosporidium, Giardia) Protozoan cysts | NSF/ANSI 53 | 52400 Microspheres /L | NA |
99.9% Tested |
Gastrointestinal illness |
| Bacteria (E. coli, coliforms) | ISO 17025 lab test | Not published | Not published | Not claimed | Gastrointestinal illness |
| Viruses | ISO 17025 lab test | Not published | Not published | Not claimed | Gastrointestinal illness |
Salts, nutrients & hardness
Dissolved ions: some you want to keep (calcium, magnesium), some you do not (nitrate, perchlorate), and the limescale hard water leaves behind.
15 contaminants
| Contaminant | Protocol | Challenge water | Filtered water | Reduction | Health concern |
|---|---|---|---|---|---|
| Nitrate NO3 | NSF/ANSI 53 | Not published | Not published | Not published | Blue-baby syndrome in infants; cancer suspected |
| Nitrite NO2 | NSF/ANSI 53 | Not published | Not published | Not published | Blue-baby syndrome in infants |
| Fluoride F | NSF/ANSI 53 | Not published | Not published | Not published | Dental and skeletal fluorosis at high levels |
| Perchlorate ClO4 | NSF/ANSI 53 | Not published | Not published | Not published | Thyroid effects |
| Sulfate SO4 | ISO 17025 lab test | Not published | Not published | Not published | Laxative effect; taste |
| Chloride Cl | ISO 17025 lab test | Not published | Not published | Not published | Salty taste; corrosion |
| Sodium Na | ISO 17025 lab test | Not published | Not published | Not published | Blood pressure in sodium-restricted diets |
| Ammonia NH3 | ISO 17025 lab test | Not published | Not published | Not published | Taste and odour; feeds nitrite formation |
| Total hardness Calcium + magnesium, °dH | EN 17093 | Not published | Not published | Not published | Limescale; no health concern |
| Carbonate hardness (limescale) Temporary hardness, KH | EN 17093 | Not published | Not published | Not published | Limescale on kettles and machines; no health concern |
| Total dissolved solids (TDS) | ISO 17025 lab test | Not published | Not published | Not published | Taste; scale |
| Calcium Ca | ISO 17025 lab test | Not published | Not published | Not published | Beneficial mineral |
| Magnesium Mg | ISO 17025 lab test | Not published | Not published | Not published | Beneficial mineral |
| Potassium K | ISO 17025 lab test | Not published | Not published | Not published | Beneficial mineral |
| pH Acidity / alkalinity | ISO 17025 lab test | Not published | Not published | Not published | Taste; corrosion |
Softening and Alkaline cartridges
All three cartridges share the same carbon block, so the results above apply to each of them . The Softening and Alkaline cartridges add an ion-exchange or mineral stage, and these are the extra parameters the lab measured for them.
| Parameter | Protocol | Softening | Alkaline | What it means |
|---|---|---|---|---|
| Carbonate hardness (limescale) | EN 17093 | Not published | Not applicable | Less scale on kettles and coffee machines |
| Total hardness | ISO 17025 lab | Not published | Not applicable | Softer-tasting water in hard-water areas |
| Total dissolved solids (TDS) | ISO 17025 lab | Not published | Not applicable | Fewer dissolved minerals overall |
| pH change | ISO 17025 lab | Not applicable | Not published | Mildly alkaline water |
| Magnesium added | ISO 17025 lab | Not applicable | Not published | Magnesium released into the water, in mg/L |
What the Duryn One does not do
A carbon-block gravity filter is very good at some things and not designed for others. The honest list:
- It is not a purifier. It does not remove bacteria or viruses. Use it with municipally treated tap water, not well water or water of unknown quality.
- Current fluoride and nitrate performance is listed in the published lab report.
- The Clean cartridge keeps calcium and magnesium in the water. If you want lower dissolved minerals, that is the Softening cartridge's job.
- Current dissolved-salt performance is listed in the published lab report.
- Results are for a cartridge within its rated life. Past 200 litres or 3 months, reduction falls. The reminder exists for a reason.
- Not every contaminant in the table is in your water. A lab can only measure what it adds to the challenge water; your utility's annual report tells you what is actually in yours.
How the testing works
The laboratory spikes clean water with each contaminant at a defined concentration, usually several times what a utility is allowed to deliver. That “challenge water” runs through a new cartridge in the Duryn One at the normal gravity flow rate, and samples of the filtered water are taken at intervals until the cartridge has passed its rated capacity
Each sample is analysed by the lab's own accredited methods (EPA 200.8 for metals, EPA 533 for PFAS, EPA 524 for VOCs, and so on). The reduction shown in the table is the filtered result against the challenge concentration.
Certifications go one step further: the certifying body audits the factory, pulls product for testing itself, and publishes the listing. We hold NSF/ANSI 42 and 372 certification and are working through EN 17093 and the food-contact package with TÜV. If you want the full reports rather than the summary on this page, ask us and we will send them.
Questions people ask about the results
Is the Duryn One NSF certified?
Current certification status, protocols, report references and public listings are maintained in the standards section above.
Why does another brand list 365 contaminants and you list fewer?
We publish only what our laboratories measured on our cartridge. Every row on this page has a report behind it. As further test rounds complete, the table grows.
Do the results apply to all three cartridges?
Use the cartridge-specific results and current product page to confirm which performance data applies to Clean, Softening or Alkaline.
What does “<0.001” in the filtered water column mean?
The laboratory could not detect the contaminant in the filtered sample. The number is the lab's detection limit, and the reduction is therefore at least the percentage shown.
Can I see the actual lab reports?
Yes. The data sheet and the reports are linked at the top of this page, and we will email the full documents on request.
Will it work on my water?
The Duryn One is designed for municipally treated tap water in the EU, UK and North America. It is not designed for well water or water that may be microbiologically unsafe. Your water utility publishes an annual quality report; compare it with the table above to see which results matter for you.
Tested, so you don't have to take our word for it.
Glass. Stainless steel. Zero plastic pitcher. And a cartridge with the paperwork to match.
Testing was carried out under controlled laboratory conditions on the Duryn One pitcher with a new cartridge. Contaminants were added to the challenge water at the concentrations shown and measured after filtration. Performance in your home depends on your water, the age of the cartridge and how you use the pitcher. Not all contaminants listed will be present in your water. The Duryn One is intended for municipally treated tap water and is not designed for water that is microbiologically unsafe or of unknown quality. Where no NSF/ANSI protocol exists for a contaminant, the laboratory's accredited method is stated in the report. Certification listings can be verified on the certifying body's public database.
NSF/ANSI, IAPMO, TÜV and Eurofins are the marks of their respective owners; no certification mark is displayed on this page except where a listing is in force.