Most of the DRVs have separate tanks for black and grey water. Nothing goes into Glenn's black tank except the toilet flush and it is a straight drop into the tank. Since he mentioned the water residue did not have any odor to it, it is suspected the source is a fresh water line. Maybe, the flush line or the sprayer line could be the source, or the supply lines that are running above the black tank.
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2016 Tiffin 40QBH
2015 38RSSA--traded
2005 36TK3--retired, but it was a good one
2017 F450 KR
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