Natural Chemistry's Metal Free enables pool and spa owners to eliminate dissolved metals that cause staining of pool surfaces and water discoloration, all without adding phosphates. Metals such as iron, copper, magnesium, and manganese can cause serious staining of pool and spa surfaces, but Metal Free easily removes them no matter the pH level or temperature of your system. Best of all, Metal Free is made by Natural Chemistry, a pioneer in bio-based pool chemicals, allowing you to buy with confidence.