Check the listing for details. Swimming Pool & Spa Metal Out Stain Prevention - 32 oz Bottle (Choose Quantity). Condition: New. Listed at 19.92 USD. Swimming Pool & Spa Metal Out Stain Prevention - Prevent Scaling - 1 Quart Bottle - (Choose Quantity) Our Metal Out helps you quickly remove metals and complex minerals from your swimming pool. The specially designed formula works with complex minerals that naturally occur in some water supplies. Metal Out is concentrated, ready to use, and will not interfere with chlorine, algaecides, or stabilizers. When used regularly, this product will help prevent scale buildup and mineral precipitation caused by other chemical additions. Dosages: 1½ oz per 1,000 gallons of pool water Scale Buildup: ¾ oz per 1,000 gallons of pool water Scale Prevention: 1-2 oz per 5,000 gallons of pool water, weekly Features: STAIN PREVENTION - our Metal Out prevents minerals such as iron, copper, and magnesium from staining or discoloring pool surfaces. This product is the ultimate prescription for a crystal-clear swimming pool. READY TO USE - the concentrated formula of our metal out is ready to use and will not interfere with chlorine or stabilizers in your swimming pool. Be cautious, as this product is corrosive and contains phosphoric acid. Keep out of reach of children. TOUGH AGAINST SCALING - trust metal out to prevent scale buildup along the waterline of your swimming pool caused by calcium carbonate. Use 1-2 oz. per 5000 gallons of pool water weekly for scale prevention and ¾ oz. per 1000 gallons of pool water for scale buildup. PERFECT YOUR POOL CHEMISTRY - complex minerals can destroy your pool’s chemistry. The specially designed formula of metal out chelates complex minerals that naturally occur in some water supplies. Note - Not recommended for Salt Water pools. Instead, use Jack's Magic Purple Stuff.