Duryn Water Journal

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.

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Newest first. Follow a question and see where the evidence leads.

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The Best Water for Coffee: Why Filtered Tap Water Makes a Difference

Why Water Quality Matters for Coffee Water makes up around 98% of every cup of coffee. Yet most of us focus on the beans, the grind, or the brewing method — and overlook the one ingredient that's always there. Tap water quality varies significantly depending...

4 min read

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Lab results & certifications →The published test results and documentation behind our filtration claims. Help centre →Questions about the pitcher, cartridges, care or your order? Start here.

Notes from the people who test the water.

brewing

The Best Water for Coffee: Why Filtered Tap Water Makes a Difference

Prefer the raw data?

Water Lab, once a month.