SPRINK-FITTER, I didn't make myself clear, I guess.
What I was referring to is the people who think they are taking the easy way out and leave the black water valve OPEN. If they do that it isn't a matter of 'will' the solids stop up the tank, but 'when'. I own an RV park, and have seen that happen several times when some smart person says to themselves, why do I need to only empty the tank when it's full. I'll leave the valve open all the time and not worry about it. Have seen septic dump trucks come out several times and clean out theur clogged tank.
This thread was about long-term septic use; not short camping trips. Of course when you leave a site you can empty your partially-filled tank.
