C.H. Cleans Hoses for Tanks & MSD - 1 GallonC.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 performanceNon toxic, biodegradable and safe to use with all materials commonly found in black water systemsSafe and effective alternative to hazardous muriatic acid treatmentsRecommended for Lectra/San and Electroscan systemsBest toilet cleaner