Metal Gone is the solution for stain treatment and metal build-up in your pool. Metal Gone is a superior formulation designed to sequester metals and remove them from the pool water by filtration. Regular use is recommended to prevent scale build-up and reduce calcium hardness. This 1 quart bottle treats up to 15,000 gallons of pool water. All swimming pool interiors are made from chemical compounds of one type or another. Water is corrosive so it must be balanced by careful addition of certain chemicals. In addition, we must sanitize the water continually and re-check the balance to ensure the pool interior is not being attacked by the water itself. Metal Gone balances your pool water beautifully!