42
Material safety.
Structural integrity.
The current NSF listing covers the carbon-block component of our water filter cartridge. Tested for helping reduce chlorine-related taste and odour.
Duryn One cartridge / Testing & transparency
Clear water.
Clear answers.
Explore the evidence behind the cartridge. Organised by what matters to you.
08Contaminant groups.
Easy to explore.
Easy to explore.
12Source measurements.
Linked to the evidence.
Linked to the evidence.
42 / 372NSF Certified.
Scope explained.
Scope explained.
The results, by category
What’s in your water?
Start here.
Search a name or open a group. Published source results and entries awaiting evidence are labelled separately.
Testing continues.
Results shared.
Results shared.
We continue testing the Duryn One cartridge with IAPMO and other labs, including against relevant (European Union) EN 17093 requirements. New results are published here with links to the full reports.
Read the source detailsExplore a group
No matching result.
Try another name, abbreviation or category.
Chlorine & disinfectants
3 topics · 3 published source resultsSource report available
Chlorine & disinfectants
3 topics · 3 published source results
Duryn One cartridge is independently tested to reduce chlorine, helping improve the taste and odour of your tap water. Explore the results below.
How these results were measured
The final table entry reports an influent concentration of 2.0 mg/L and an effluent concentration of <0.1 mg/L. Calculated reduction: 99%+.
Recorded rows throughout the test range from approximately 99.4% to 99.99% reduction. The tested sample is carbon filter.
12 September 2026 · Ref. 20545A/25-26
Read the full source reportPFAS & forever chemicals
14 topics · 8 published source resultsSource report available
PFAS & forever chemicals
14 topics · 8 published source results
Seven PFAS compounds are measured individually in the source report. Each percentage below is a conservative minimum calculated from the laboratory reporting limit.
PFPeA
Perfluoropentanoic acid
No published result
PFHxA
Perfluorohexanoic acid
No published result
PFUnDA
Perfluoroundecanoic acid · PFUnA
No published result
PFDoDA
Perfluorododecanoic acid · PFDoA
No published result
HFPO-DA
GenX
No published result
ADONA
4,8-Dioxa-3H-perfluorononanoic acid
No published result
How these results were measured
The influent values are PFOA 485, PFOS 985, PFHxS 321.1, PFNA 53.4, PFHpA 40.3, PFBS 268.3 and PFDA 8.21 ppt. Every individual effluent value is reported as <5 ppt.
Minimum calculated reduction = (1 − reporting limit ÷ measured influent) × 100. Displayed minimums are rounded down, not up. No fixed 99.5% reduction is assigned to every PFAS compound.
23 September 2025 · Ref. 20545-C/25-26
Read the full source reportLead & heavy metals
12 topics · 4 published source resultsSource report available
Lead & heavy metals
12 topics · 4 published source results
Lead, cadmium and mercury have source measurements. Each other metal is listed separately so future results can be added without implying broader coverage.
Copper
Cu
No published result
Hexavalent chromium
Chromium VI · Cr(VI)
No published result
Trivalent chromium
Chromium III · Cr(III)
No published result
Nickel
Ni
No published result
Aluminium
Aluminum · Al
No published result
Selenium
Se
No published result
Uranium
U
No published result
Manganese
Mn
No published result
How these results were measured
Lead is 0.140 → <0.005 mg/L, cadmium is 0.028 → <0.002 mg/L and mercury is 0.0053 → <0.001 mg/L. The greater-than percentages are calculated using those reporting limits.
Its tested volume should not be replaced with the cartridge replacement interval.
23 September 2026 · Ref. 20545D/25-26
Read the full source reportVOCs & solvents
18 topics · 18 published source resultsSource report available
VOCs & solvents
18 topics · 18 published source results
A place for individual VOC results and a clearly identified surrogate test, when supported by a dedicated reduction report.
Chloroform
Potential VOC surrogate; report required
>99.98%Source result
Benzene
Based on surogate
>99%Source result
Ethylbenzene
>99%Source result
Toluene
>99%Source result
Xylenes
Total xylenes
>99%Source result
Trichloroethylene
TCE
>99%Source result
Tetrachloroethylene
PCE · perchloroethylene
>99%Source result
Carbon tetrachloride
>99%Source result
Chlorobenzene
>99%Source result
1,2-Dichloroethane
>99%Source result
1,1-Dichloroethylene
>99%Source result
cis-1,2-Dichloroethylene
>99%Source result
trans-1,2-Dichloroethylene
>99%Source result
1,2-Dichloropropane
>99%Source result
1,2,4-Trichlorobenzene
>99%Source result
1,1,1-Trichloroethane
>99%Source result
1,1,2-Trichloroethane
>99%Source result
Styrene
>99%Source result
The results are based on VOC surrogate testing. This testing uses a representative compound to assess removal performance under the tested conditions.
Pesticides & herbicides
13 topics · 0 published source resultsMore evidence to add
Pesticides & herbicides
13 topics · 0 published source results
Individual agricultural chemicals, with an editable entry for each future laboratory result.
Atrazine
No published result
Alachlor
No published result
Simazine
No published result
Lindane
No published result
2,4-D
No published result
Carbofuran
No published result
Heptachlor
No published result
Heptachlor epoxide
No published result
Endrin
No published result
Methoxychlor
No published result
Chloropicrin
No published result
Dinoseb
No published result
Glyphosate
No published result
No reduction result is published for these entries. A future VOC surrogate report may support only the chemicals and claim conditions that it explicitly covers.
Pharmaceuticals & emerging compounds
15 topics · 0 published source resultsMore evidence to add
Pharmaceuticals & emerging compounds
15 topics · 0 published source results
Medicines, hormones and other emerging compounds are grouped together for easy reference. Their presence here is not a reduction claim.
Bisphenol A
BPA
No published result
Estrone
No published result
Ibuprofen
No published result
Naproxen
No published result
Phenytoin
No published result
Nonylphenol
No published result
Atenolol
No published result
Carbamazepine
No published result
Meprobamate
No published result
Metolachlor
No published result
Trimethoprim
No published result
DEET
No published result
Linuron
No published result
TCEP
Tris(2-chloroethyl) phosphate
No published result
TCPP
Tris(1-chloro-2-propyl) phosphate
No published result
No published reduction results are attached to this group. Each row is ready for its own measured result or an explicitly supported group claim.
Particles, cysts & microbes
5 topics · 3 published source resultsSource report available
Particles, cysts & microbes
5 topics · 3 published source results
The source report tests a cyst surrogate. Microplastics, finer particulates, bacteria and viruses require their own evidence.
Cyst surrogate
3 µm microspheres
Conservative display; report records 99.9%.
99.5%+Source result
Bacteria
Including E. coli
Not claimed
Viruses
Not claimed
How these results were measured
The reported challenge is 52,400 three-micron microspheres per litre, with an effluent count of <20 per litre. The laboratory records 99.9% reduction and LRV 3.41.
The displayed 99.5%+ is deliberately conservative. This is a microsphere surrogate result, not a live-organism test or a microplastic test at 0.5–1.0 µm.
19 September 2025 · Ref. 20546/24-25
Read the full source reportFluoride & dissolved substances
6 topics · 1 published source resultsSource report available
Fluoride & dissolved substances
6 topics · 1 published source results
These entries make the current claim limits explicit and leave space for future product-specific documentation.
Fluoride
Duryn One cartridge
>82%Source result
Nitrate
NO₃⁻
No published result
Nitrite
NO₂⁻
No published result
New contaminant
No published result
Water hardness
Calcium and magnesium · limescale
Not claimed
Total dissolved solids
TDS
Not claimed
Duryn One reduces fluoride by >82%. No softening or TDS-removal claim is made here.
“>” means greater than the displayed value. Values based on a laboratory reporting limit are minimum calculated reductions, not exact measurements. “No published result” is not a removal claim or a promise that testing is underway.
Material choices, inside and out
Steel, down to
the end caps.
The Duryn One cartridge uses solid medical-grade 316L stainless steel end caps instead of plastic. Our choice of materials goes beyond the glass pitcher and stainless steel funnel.
NSF CERTIFICATION
Certified at the core.
Certification documents and contaminant-reduction tests answer different questions. Here is what each document covers.
Material safety.
372
Lead Free Certified.
Water-contact materials.
The carbon block in the Duryn One cartridge meets NSF/ANSI/CAN 372 certification requirements for lead-free materials.
The NSF certificates cover the carbon block inside the Duryn One pitcher’s cartridge.
The original documents
The evidence.
One click away.
Original laboratory PDF
Chlorine reduction
IAPMO India
12 September 2026
Ref. 20545A/24-25
NSF/ANSI 42
Original laboratory PDF
PFAS reduction
IAPMO India
23 September 2026
Ref. 20545-C/25-26
NSF/ANSI 53
Original laboratory PDF
Lead & heavy metals
IAPMO India
23 September 2026
Ref. 20545D/25-26
NSF/ANSI 53
Original laboratory PDF
Cyst-surrogate test
IAPMO India
19 September 2026
Ref. 20546/24-25
NSF P231 reference
Source names, conditions and product correspondence
All product references on this page use Duryn One cartridge. The published laboratories’ reports retain their original submitted sample names. Product-to-report correspondence must be documented before these source measurements are presented as verified Duryn One performance.
- Chlorine: Salvi Line Ltd “Carbon Filter”, IAPMO 20545A/24-25. The displayed 95% is calculated from the final 300 L row; other recorded rows range from approximately 94.4% to 95.2%.
- PFAS: Salvi Line Ltd “Carbon Filters”, IAPMO 20545-C/25-26. Individual values use the 35 L table. Effluent is reported as <5 ppt for each of seven compounds. Although one narrative mentions 100 L, the published data table ends at 35 L.
- Metals: Salvi Line Ltd “Stainless Steel Tank with Carbon block”, IAPMO 20545D/25-26. Values use the 50 L table. The report notes declining flow.
- Cyst surrogate: Salvi Line Ltd “Carbon Filter”, IAPMO 20546/24-25. The test uses 3 µm microspheres. The report records 99.9%; this page displays a conservative 99.5%+. This does not establish microplastic, bacteria or virus reduction.
A little more clarity
Good questions.
Straight answers.
Does a listed contaminant mean it is reduced?
This directory shows both source results and topics awaiting evidence. Only entries labelled “Source result” have a published measurement here. Other entries display “No published result” or “Not claimed”.
What about VOCs and the chemicals in that group?
Surrogate testing has been completed with positive results. See the attached report for the tested compound, test conditions, and scope of the findings.
Does Duryn One remove fluoride?
Yes. Duryn One reduces fluoride by >82%.
How often should I replace the cartridge?
Follow the current product guidance: 100 US gallons (approximately 379 litres) or 90 days of use, whichever comes first. Higher usage may require an earlier replacement. This replacement interval is not a statement that every contaminant has been tested through that volume.
Why are some results shown with a greater-than sign?
If the filtered concentration is below a laboratory reporting limit, the exact reduction cannot be calculated. We use that limit to show a conservative minimum. For example, a result reported as <5 ppt is not the same as zero.
Is “tested” the same as “certified”?
A laboratory report describes a specific sample under specified conditions. Certification applies to the products, components and claims covered by the certifying body’s official listing. Both the report and the listing should be read for their precise scope.
What would you like us to test next?
Tell us the contaminant or the question you want answered.