How much potassium metabisulfite should I add when racking my wine or cider?
Measurements in grams/gallon please. Thanks!
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I'm not certain about grams per gallon (why are you mixing metric and imperial?). 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 per gallon. (1/8th of 4.4g is .55g)
Adding a little extra won't hurt, especially if your wine or cider is done fermenting.