Lot's of good advice here. Sometimes it also depends on your travel plans. For instance, if I'm staying at a place with sewer hookup for only a day or two before going on to the next stop, I will not dump black tank until I get to the next place assuming sewer hookup or dump station will be available. I find the a day of driving does a great job of breaking down all solids because of the water movement. And if I know I have room, I will always add extra water to the black tank. I've never had a problem.
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