Raritan C.H. Cleans Hoses f/Tanks MSD - 1 Gallon [1PCHGAL]C. H. Cleans Hoses for Tanks & MSD 1 Gallon C. H. dissolves scale and calcium build up and adds life to your boat's sanitation system while providing less maintenance and less cost over time. C. H. is specifically designed to remove uric scale and calcium carbonate from black water systems from the toilet to the holding tank without having to remove hoses. Features: Dissolves clogs which can cause odors and poor flushing performance Non toxic,