Campden tablets, also known as Potassium Metabisulfite (KMS) prevents wild yeast, bacteria growth, and oxidation in your wine. The tablet form takes the guesswork out of measuring. Each tablet adds approximately 75 ppm free sulpher dioxide per gallon of must. Crush the tablet into a powder and dissolve in water before using. Recommended dosage: One tablet per gallon. Wait 24 hours before adding yeast to ferment.
Some use campden tablets to remove chlorine from municipal water. Dose: one tablet per 20 gallons in an open container. Wait 24 hours before use.
Storage: Dry, dark and cool. Will decompose with moisture.