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Vintner's Precipitated Chalk Acid Reduction Powder (Calcium Carbonate) - 1 kg - Can be used for wine & beer making, agricultural, chalk paint, homemade toothpaste, antacids and much more! uses in beer and wine making, use 5/8 teaspoon per gallon to lower acidity 15 percent. Use before fermentation. Do not reduce acid more than 30 percent.