Over just a weekend I'll fill the black to 2/3 on the panel before dumping to help get a good purge. I don't worry much about how full the gray is before dumping, my only concern is enough gray to rinse the drain hose out.
I put about four gallons into the black tank to make sure I fill up the drain pipe and cover the floor some.
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Now-2014 Sierra 346RETS 5er BUB
Then-2002 Keystone Springdale 286RLDS TT
Nights camped in 2014-28, 2015-127, 2016-10
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