Gypsum (Calcium Sulphate)

Gypsum (Calcium Sulphate)

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Gypsum (also known as Calcium Sulfate) is used to add permanent hardness (Calcium ions) to brewing water. 1 gram in 1 gallon changes the salt levels by 61.5 ppm calcium, 147.5 ppm sulfate and adds 153.5 ppm to the hardness.