Darby,
I have been aware for a while that the toilet & bathroom sink combine in the black tank (as the shower & kitchen sink combine in the grey tank).
Like you, there are 2 of us using the toilet. On our last outing in the fall, it was more convenient to use the mh toilet facility than the campground's. No problem because there was a sewer hookup anyway.
Within a couple days, though our black tank indicator displayed less than ? full, water and "stuff" filled the toilet standpipe & would not flush down. I ended up using a stick plus water hose to move the "pile" & get it out the sewer hose. Several days later, the same thing happened. We used plenty of water during the days, filled the tank using the internal flush nozzles in preparation to dumping and still I had the problem. We'll be changing our procedure to see if we can eliminate the problem.
What a way to spend vacation time!
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