I use Calgon water softener treatment. Its sometimes hard to find, but WallyWorld usually has it in the detergent/dish soap area. I put a capful in my black and 2 gray tanks. It makes the water more "slippery" and "stuff" doesn't hang up on the plastic tanks as readily.
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Mark, Vicki, & Scout THE dog
2015 Hemisphere 282RK
2016 GMC 3500HD Duramax dually
1992 Goldwing Aspencade
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