One tablet per gallon adds approx 30 ppm free So2. Two ounce bottle of approximately 110 tablets. Many winemakers prefer Potassium Campden tablets over sodium because free sodium ions in Sodium tablets may leave an unpleasant aftertaste in the wine, Potassium tablets stay fresher longer and potassium can help to precipitate tartaric acid.
*Beer brewers can use one tablet per 20 gallons of water to remove chlorine.