When I drain the grey water tanks, they never fill up the sewer hose like my old Montana trailer did. When I drain the black water tank, it fills the sewer hose at the beginning of the draining process and then quickly tapers off. The reason I can tell how the water is draining is because I use a clear 5 inch connector so I can see what's going on. I use the black water flush and also have put Calgon water softener in the tanks to clean them but nothing has changed.
Are your tanks working the same?
Are your tanks working the same?