Keep both tanks closed until you need to dump. Just remember that having plenty of water in the tanks is a good thing. When I dump the black tank I usually fill the toilet at least three times to the top with water.
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2011 Eagle 330RLTS with just about every option.
2017 Silverado 1500 4x4 5.3 with tow package. (no, we don't tow the Jayco with it.)
2018 Surveyor 265RLDS well equipped.
Life in the slow lane is still life.
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