Originally Posted by 73shark
I don't think there would be any possibility of backflow since there is a check valve in the flusher. I've never seen any evidence of black water at the flusher connection.
Just curious, why don't you just fill your freshwater tank w/ the campground connection?
It's kind of fun to have the city water connected and also be able to fill the FW tank. The smaller shower hose also helps the FW tank fill without tons of "burping".
I'm weird like that :-)