[wingnut60]

While not always a pretty sight, I just look into the black tank thru the toilet opening to watch the level when I get concerned about the level. One thing wrong with my hose flusher is the nozzle is located well above the bottom of the tank (seems it would work best spraying across the bottom) and doesn't move fluid around until the level is at least 3/4 full. When hooked to a sewer, I fill the tank several times and dump while the flusher is on, then flush the toilet for a while--this sequence seems to work best on my tank. I do use a LOT of cg water to clean the tank each time we leave for another location.

And, my level indicator is not accurate at all, whether empty or full.