Have used a sewer solution since 1994 but only at home. Takes about 15 minutes to empty both tanks but it does work if used properly.
For dumping at dump stations use the big hose or you will be very unpopular.
Most of the time there are no faucets to screw on the jet hose anyway so it wouldn't work.
At home, however, it works like a champ. I dump before we leave the last campground when heading home but I have to stop at least once on the way. So at home I get the tank completely emptied before parking it in the garage.
We have land so I run it on the grass. When we lived in town I dumped it into the service sink in the garage.
Hope this helps.
N. Brevard County, Florida
2010 Lexington 255 GTS
2000 Jeep Cherokee Toad