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I'm not certain about grams per gallon (why are you mixing metric and english?). The general rule for wine (and probably cider as well) is one campden tablet or 1/8th tsp of k-meta per gallon. According to wikipedia one campden tablet typically weighs .44 grams and 10 campden tablets equals 1 tsp of k-meta so I'd guess between .44 and .55 grams of k-meta ...


One tablet in one gallon of must yields 150 ppm total sulfur dioxide. Those instructions are on the bottle of Campden tablets, which are potassium metabisulfite. Here's a source for Campden tablets. Generally, Campden tablets are never used in beer, only in wine, mead, and sometimes cider. Potassium Sorbate also has instructions right on the bottle. ...

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