We are getting ready to take our Fifth Wheel on our first trip. I have a water inlet that says this on it: CAUTION SEWER TANK FLUSHER Sewer tank valves must be OPEN when using this inlet. OK...
Turn the flusher on before dumping. Leave it on during the whole dumping process. Leave it on for a bit after closing the valve. Always travel with a few gallons in there to slosh around.