Gypsum (Calcium Sulfate), use 1/4 to 1/2 teaspoon per 5 gallons to lower pH, increase hardness, and add hop-enhancing sulfates.
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Gypsum (Calcium Sulfate), use 1/4 to 1/2 teaspoon per 5 gallons to lower pH, increase hardness, and add hop-enhancing sulfates.
