Fi-Clor Stain & Scale Inhibitor has been specially developed to help prevent staining by dissolved minerals, especially where the water is discoloured or where levels of iron, copper and manganese are known to be too high. It can also help prevent the formation of scale and rough deposits on pool surfaces. Use this product to prevent staining and scaling; if pool surfaces have already been stained or scaled use Fi-Clor Stain and Scale Remover.