The sensor on the black water tank hasn't worked for sometime and had registered a constant 3/4 full regardless of how full it really was. So.... I flushed and reflushed the tank three times while using the built in black tank flush and voila, the sensor works again. Filled the tank again and added 2 cups of Calgon per other threads in the forum for future protection of the sensors and it smelled pretty good too. Will continue to add Calgon every other dump. May consider making my own Calgon in the future using one of the recipes I found on line. Hopefully this will eliminate future sensor problems of my black tank.
2013 Surveyor SVF 293
2013 Ford SD F250 4x4 SC; 6.2 EFI V8
Reese 18K Elite w/slider - Ada, Michigan