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Calcium Sulfate (Gypsum) adds hardness to brewing water.
Add 1 to 2 tsp per 5 gallons or as directed by your recipe.
mr.jimsherwood (verified owner) – December 25, 2016:
Works fine and average pricing; every home brewer should have some. But, unless I’m confused, doesn’t Gypsum “Lower” Mash pH?
Not that bad
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Water Chemistry and Minerals
Gypsum Bulk Pack 5 pounds
Calcium Carbonate – 5 pound BULK
5.2 Stabilizer – 4oz
Tartaric Acid 3oz
Calcium Chloride – 5 pound BULK
Citric Acid – 3oz
Calcium Chloride – 2oz
Calcium Carbonate – 4oz