Originally Posted by Gripper
3 inches give or take seems about right. It does not take much to throw the reader off maybe some toilet paper or something stuck. Can you give it a good clean out. Even if you have the connection to flush the black tank I still use my manual one hooked to the garden hose, a 2 foot pipe with four small holes in the cap, you stick this in your holding tank. My guess is something is stuck in there throwing the measurement off, we can go 7 to 8 days with our black tank. One thing that bugs me with ours is the outside kitchen sink is connected to our black tank
Sorry maybe I will clarify a bit. I use the geo method as well but I have also the benefit to clean out at home. I set it up so I can hook up to my sewer clean out. No matter where I empty once home I will flush as you call geo method and then use my manual method as I feel it hits with pressure in the corners much better, and then I once again follow with the trailer setup to flush. In my mind can never be to clean down there..