White vinegar. It also helps to discourage the deposits created when sewage and salt water mix.
I use about a cup a day when staying aboard, and try to leave some vinegar-infused water in the discharge lines when I leave the boat. (The latter wouldn't apply to boaters flushing with fresh water.)
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.