Notes from the people who test the water.
What is in tap water, how filters actually work, and where the marketing stops matching the lab reports. Written by the team that builds Duryn, with sources at the end of every piece.
aarke vs duryn
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Granule-Based Water Filters: What They Do Well and Where They Fall Short
Current Duryn One cartridge and refill plan Duryn currently offers one cartridge type. Replace after 100 US gallons (approximately 379 litres) or 90 days of use, whichever comes first. Higher usage may require an earlier replacement. Duryn One reduces fluoride by >82%. Start with the...
5 min read
Duryn vs Aarke (UK): two “design pitchers” - built for very different ideas of clean water
Current Duryn One cartridge and refill plan Duryn currently offers one cartridge type. Replace after 100 US gallons (approximately 379 litres) or 90 days of use, whichever comes first. Higher usage may require an earlier replacement. Duryn One reduces fluoride by >82%. Start with the...
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