BioGuard Pool Magnet Plus (1 qt) (4 Pack) Pool Magnet Plus is a highly concentrated formula that removes some present stains and prevents staining from iron, copper and manganese. It also eliminates discolored water from metals. Use monthly in pools that hold metal containing fill water. Use in conjunction with Sparkle Up to remove metals from the water. Product Information: pH 3.5 Prevents stains caused by metals Removes fresh metal stains Easy to apply Concentrated formula Use as needed Directions for use: 1. Use 1 quart of Pool Magnet Plus per 10,000 gallons per 1ppm of metals 2. Add directly to your swimming pool in the area of any localized metal stains 3. Maximum recommended does is 3 quarts per 10,000 gallons For Maintenance 1. When make-up water contains metals, add 3 fluid ounces per 1,000 gallons of water added to the swimming pool Removal of Fresh Stains 1. Turn circulation off for 8 hours 2. Pour 1-3 quarts (depending on the severity of stains) of Pool Magnet Plus directly in the area of the stain 3. Do not swim or operate pump for 24 hours 4. After the waiting period, turn the pump on, circulate water continuously for 5 to 7 days and brush your swimming pool walls daily