Gypsum adds permanent hardness (calcium ions) to soft brewing water. Brewers that use distilled, or RO, water like to add some gypsum back into the water to give it some hardness. Gypsum can also be used to lower the pH of water. Use 1 teaspoon per 5 gallons.
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Stop buying 2 or 4 ounces at a time and simply by a pound of this stuff as you will eventually need it and it costs almost the same as the smaller quantities.
It's white! It's powdery! It's got calcium ions AND sulfate ions! With enough of this fine gypsum, you could make a cast for a broken limb, or a sculpture of your favorite object. Instead, I just use mine in stuff. But for ALL YOUR GYPSUM NEEDS, this is the thing. Can't say enough about this gypsum.
I use the gypsum with every batch of beer that I brew. I have a 225 foot deep well that has excellent water for brewing and I use the water from outside spigot for the first three gallons and switch over to water from the kitchen tap from that point on. The water from kitchen is softened and I use the gypsum to balance enough hardness. Seems to work just fine.
I add two teaspoons for hoppy beers, one for others. It adds the Sulphate I need to get my hoppy beers to really stand out. Otherwise the hops are kind of on the dull side._x000D_