Gypsum (Calcium Sulfate)
$1.29
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Calcium Sulfate. 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. Promash is a useful utility to calculate water salts.
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