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Calcium chloride is usually used in place of Gypsum when sulfates are not desired. Calcium chloride will adjust your mash pH down. 1 gram in 1 gallon changes the salt levels by 72 ppm calcium, 127.5 ppm chloride and adds 180 ppm to the hardness.
Water: A Comprehensive Guide for Brewers (Book) $18.99
Lactic Acid (88%) - 4 oz. $4.99
Phosphoric Acid (10%) - 4 oz. $3.49
Anvil Small Scale $19.99