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Water is 98% of your coffee, and two numbers describe it – Green Cafe Land
A copper gooseneck kettle on a cafe counter, with a ceramic pour-over dripper behind it

Water is roughly 98% of what ends up in the cup, and the last thing most people adjust. It decides which compounds come out of the grounds and which get neutralized on the way. Two numbers describe most of that, and the common error is treating them as one number.

The two are total hardness and alkalinity. The Specialty…

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