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 performance Non-toxic, biodegradable, and safe to use with all materials commonly found in black water systems Safe and effective alternative to hazardous muriatic acid treatments Recommended for Lectra/San and Electroscan systems Best toilet cleaner WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.