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A comment on I'm Wirecutter's water-quality expert. I don't filter my water. Parent comment
There is a whole book on the topic (2015, with a new edition supposedly coming soon):
https://collectedcoffee.com/products/water-for-coffee
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There is a whole book on the topic (2015, with a new edition supposedly coming soon):
https://collectedcoffee.com/products/water-for-coffee