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I use the microbiological black tank treatment (Unique brand available on Amazon). They tell you NOT to flush your black tank, just empty. If you flush, you flush out the microbes that are remaining in your tank. Add about 3 gallons back into tank, add a small amount of treatment back to tank and you’re done. This stuff will clean your tank, breaks down TP and solids in a matter of minutes. Cleans your sensors too. The microbes travel up the sides and top of your tank, and “clean” your tank top to bottom. Will eliminate any pyramids in 24 hours or less.
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