Jack, if you're doing just one load you might get away with using the blue tank. Maybe. Ours drains into the bath gray tank, by the way. When the dump valve is not open (like in I forgot to open it) then ours backs into and out of the shower and into the basement as well as all over the bath area. (been there, too). I can tell you from experience if you start with an empty gray tank you might get two loads in there with the third one overflowing the tank. This is one reason we feel we have to have a sewer connection if we stay somewhere more than a week.
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