Does your tank have an inspection port? If not, you really need to add one. My last boat did not have an inspection port, and when I looked into the tank I could see slime, dirt, and other bad things inside the tank. I added an inspection port (easy to do). I can fit my arm inside the tank so I can scrub the sides of the tank and get it very clean.
After the tank is clean I add water and sanitize it as described in the above article.
My current boat came with inspection ports and the tanks were much cleaner.
I still won't drink the water in the tank, but I don't mind using it for cooking and cleaning.
Day To Remember, 1986 O'day 35 For Sale
Deep Blue C, 2002 C&C 110 For Sail
Mt. Sinai, NY
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