Can help prevent staining and scale build up. Protects plumbing when used on a regular basis. Metal Magic will remove metals in the water first, then will begin to lift stains from the pool or spa surface. Changes them into a crystal that is removed by the filtration. Clean filter, chlorine level at 1 ppm, pH 7.5 or higher, and calcium level should be below 350 ppm. For light discoloration 1 qt. per 10,000 gallons of water. If heavy staining, use instructions (Aqua Pure can assist) to perform sponge test to determine application dosage. Water may cloud. ProTeam® Microfloc Clarifier or ProTeam® Dry Clarifier will aid in the speedy removal of suspended particles. Maintenance 3 oz. per 10,000 gallons weekly.