In The Swim Stain Away for Above Ground and Inground Swimming Pools - Removes Mineral Stains from Iron, Copper, and Magnesium in Swimming Pools - 1 Quart
Prevents metal stains and calcium build-up! Compare to Pool Magnet, Super Sequa-Sol and Metal Control. Prevents ugly stains, scaling and brown water due to minerals. Will actually lighten some stains! Restores brilliance and shine to your pool water. A must for areas with heavy iron content or well water. Initial Dosage: 15 oz. per 10,000 gallons. Weekly Dosage: 5 oz. per 10,000 gallons. For existing stains use 30 oz. per 10,000 gallons. Apply directly over stain if possible. Contains: Diphosphonic Acid.