I used the Sewer Solution a couple times and put it in a shed and forgot it. When you open the dump valve and you have the standard size sewer hose it's similar to flushing a toilet. The sewage flows quickly and the rapid flow will help to move out the solid waste. With the use of a pump and small hose you're draining off the liquid and leaving solids behind and you have to use the black tank flush to empty the solids as well as clean the tank walls.
2013 365 BHS Eagle Premier
2004 Dodge Ram 3500 Dually