Black flush backflow on disconnect?

rhyno

We used the black flush for the first time recently after checking to make sure everything was good and tight. It sounded like it was doing the job but when we disconnected we had quite a bit of water coming out of the connection port on the Nautilus. Is this normal for the 2021 Tab 400?

manyman297

I wanna say I had the same issue. I think I was dealing with the excess water in the flush pipe just coming back out of the inlet which is probably unavoidable. What I may try is disconnect the hose at the water source and letting the hose (and consequently the flush piping) to drain and then disconnect from the nautilus panel. 

ChrisFix

@rhyno
It is "normal" for my 400. I believe (and hope) it is the water that is on the clean side of the back-flow preventer.