Most people do not use enough water when they flush. After I dump I shut the valve leaving the tank flusher running. I allow the tank to fill to about 20%. I shut the flusher off, that way I have enough "starter fluid" in the tank. I also encourage everyone to use lots of water when they flush. I also do not dump until the black tank is at least 60% full. If I need to dump before then I add water via the tank flusher to get to 60% then dump. Managing the liquid in your black tank is probably the most important thing you can do.
Dave, Bobbi and Fenway
2005 38' FDTS Alpine Limited, 2016 Jeep Grand Cherokee Limited
Cape Cod, MA