Originally Posted by wiscampsin
My last camper was a Winnebago Access 31c. It was previously a rental unit, so as you can imagine it was not well maintained during it's short time operated by muggles.
Almost immediately I noticed that the head would "plug up" after just the first evening camping. It drained down into a 90 degree elbow, then into the black tank where there was some sort of obstruction. The tank would read empty, but the bowl would be full of waste unable to go down. Yuck. This happened multiple times during our first season.
I reasoned that the muggles probably didn't have enough water in the black tank to start, and the solid waste probably built up into a pile near where the waste entered the tank. I used 1 cap of liquid water softener and 1 scoop of laundry detergent with 1/2 tank of water on the way to the campground. I dumped upon arrival.
I did this three times consecutively and never had a backup problem again. The detergent and water softener broke the waste free and let it drain out of the tank.
I definitely recommend the GeoMethod.