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H2O, Hello There: An Introduction to Water for Coffee Brewing

Have you ever taken a bag of beans home from your favorite shop, brewed them according to the recipe printed on the bag, and found the resulting brew to be lackluster and almost completely different from that cup you enjoyed in the cafe? You might wonder if it was the grinder, or maybe your technique was off -- but what if it’s actually something else, what if a tiny pinch of extra magnesium in your water was to blame?