Proteam Metal Magic is one of the most effective stain and scale removers available. It does a great job removing problematic metals from swimming pool water. Removes metals such as iron, copper, silver and manganese. Can be used to remove surface stains caused by metals. For mild staining or low metal level in water, use 1 quart per 10,000 gallons of pool water. For direct application to pool surface refer to the ProTeam Metal Magic Sponge Test .pdf (below).