Replacement cartridge · Fits every Duryn One
Carafe filtrante Duryn One
Everything the Clean cartridge does, then a mineral stage that adds magnesium and lifts the pH. Smooth, slightly sweet water for people whose tap water tastes heavy or flat.
- Same filtration as Clean: PFAS, lead, chlorine, microplastics
- Adds magnesium to every glass
- Raises pH
- No salt, no chemicals. 200 litres or 3 months
30-day money-back guarantee
- Fits every Duryn One, including the first drop
- Clicks in. No screwing, no leaks
- Tested by IAPMO R&T to NSF/ANSI protocols
- Refill Plan: skip or cancel anytime
In the box: One sealed cartridge in a recyclable tube. No plastic wrap.
What's inside
Best for: Hard or flat-tasting water, and anyone who wants magnesium in every glass.
- 1
Stainless pre-screen
Catches sediment and rust before they reach the block.
- 2
GravityPlus™ carbon block
The same block as the Clean cartridge: PFAS, lead, chlorine, VOCs and microplastics out.
- 3
Magnesium mineral stage
Food-grade magnesium media releases magnesium ions into the filtered water and neutralises acidity.
What it does to your water
Every claim here has a lab report behind it. The full list, with percentages, is on the lab results page.
Reduces
Adds
Smooth and slightly sweet. Hard water loses its heaviness.
Which cartridge is right for you?
Same fit, same carbon block. The difference is what happens after the block.
| Clean | Alkaline | Softener | |
|---|---|---|---|
| Best for | Most municipal tap water | Flat or heavy-tasting water | Hard water and limescale |
| PFAS, lead, chlorine, microplastics | Reduced | Reduced | Reduced |
| Extra stage | None | Magnesium mineral stage | Ion-exchange stage |
| Limescale | Unchanged | Softer taste | Reduced |
| pH | Unchanged | Raised | May drop slightly |
| Minerals | Kept | Magnesium added | Calcium and magnesium reduced |
| Taste | Clean, neutral | Smooth, slightly sweet | Soft; better tea and coffee |
| Cartridge life | 3 months | 3 months | 3 months, less in very hard water |
Replacing takes two seconds
No screwing, no tools, no wet hands. The QR code on the tube opens this guide.
- 1
Lift and pull
Take off the walnut lid and lift the old cartridge straight out of the steel funnel.
- 2
Rinse
Hold the new cartridge under the cold tap for 30 seconds to wet the carbon block.
- 3
Click
Drop it into the funnel and press until you feel it seat. Fill, discard the first pitcher, then drink.
Specifications
- Fits
Duryn One, every edition
- Capacity
200 L (about 52 US gal) or 3 months
- Water
Municipally treated tap water, 4–30 °C
- Testing
Activated carbon certified to NSF/ANSI 42 and 372; tested to NSF/ANSI 53 and 401 at IAPMO R&T
- Made in
Assembled in India
Reviews
Questions
How do I know when to replace it?
Every 3 months or 200 litres, whichever comes first. We email a reminder from the day your cartridge ships. On the Refill Plan the next one arrives before you need it.
Can I switch between Clean, Alkaline and Softener?
Yes. All three have the same click-in fit, so you can change any time. On the Refill Plan, change the cartridge type in your account before the next delivery.
Does it fit the first-drop pitcher?
Yes. Every Duryn One uses the same cartridge mount.
Do I need to prime a new cartridge?
Rinse it under the cold tap for 30 seconds, click it in, and discard the first full pitcher. After that, drink.
Will it fit a Brita or another pitcher?
No. The click mount is Duryn's own design, and the cartridge only fits the Duryn One.