Method and composition to inhibit staining of porcelain surfaces by manganese

摘要

Method and composition to inhibit the staining of water-contacting surfaces, such as those in a toilet bowl, which is caused by manganese present in household water in the presence of an oxidizing material. Manganese staining is inhibited by supplying to the water 0.1 to 10 ppm of a substance selected from sodium polyacrylates and ethylenemaleic anhydride copolymers. Compositions are also described in the context of an automatic toilet tank dispenser which provides sufficient quantities of the above materials in solution to inhibit manganese staining of toilet bowl surfaces.