Similar to the Sodium Metabisulfite only with the potassium, Potassium Metabisulfite, 4 oz 7050A is used to help kill wild yeast and bacteria during the wine making process. It allows your yeast a better opportunity for a more efficient fermentation and improves flavor while inhibiting enzymatic browning in white wines. Available in a 4 oz. package: Use for ideal wine fermentation.