For Protable water storage tanks. Makes stored water taste sparkling fresh and clean. completely get rid of musty, moldy, plastic and anti-freeze tastes. Saves you carting fresh water. No chlorine. Leaves no detectable after taste. Controls build up of odors and slime forming bacteria. Enhances taste of stored potable water. To be used in hot and cold water systems using plastic, fiberglass or metal tanks. Precleaning or rinsing of supply water tanks in not necessary when using this product. It will produce fresh tasting water by decomposing odors and off flavours in to harmless gasses.