Swish Barrel Storing and Cleaning Tablets are pre-measured doses of sulfates formulated to kill bacteria and inhibit the growth of yeast and microbes in the barrel. When storing or cleaning your barrel between uses, dissolve the appropriate number of tablets in water. Pour mixture in the barrel and fill completely with additional water. Store in cool damp conditions if possible. Rinse 3x prior to use. Sanitize your barrel with a Swish Barrel Cleaning Kit after 2 or 3 uses. Directions: To store or clean your barrel between uses, dissolve tablets in a glass of water. Pour into barrel and top off with water. 1 tablet is needed for each 1-3 liter barrel. Empty and rinse barrel 3x prior to use.