These are campden tablets (Potassium Met bisulfite).Prevents Wild Yeast, Bacteria Growth, and Oxidation in WinePotassium met bisulfite in tablet form..
This product is calcium carbonate, use 5/8 teaspoon per gallon to lower acidity 15%. Use before fermentation. Do not reduce acid more than 30%.Calcium Carbonate CaCO3 CAS : 471-34-1Wine MakingBeer Mak..