You also need a good amount of grey water to wash down the black water out of the hose when you dump. We don't empty ours out unless it's really full, or we are also dumping the black water. If we're going to have to dump the black water too, we don't empty all the way.
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'97 2720 & '01 Chevy Silverado 1500 4x4
2011 & 2017 Prii, 10'x18' & 10'x9' Tents
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