I had sensor problems with both my TT and my previous motor home. Never was able to keep them working properly.
However, with my new motor home, I religiously put a cup of liquid laundry detergent (Oxy Clean) and a cap full of liquid Calgon water softener in both thanks EVERY time we travel.
Typically, we travel like three or four days to our destination on the Oregon coast and then stay there for a month or two. We then travel one day to another Oregon destination for a week stay and then back to the coast. At that point, we normally stay for up to three months without moving the coach and using the "facilities" daily. At least twice a week (while staying put) I empty the black tank and transfer some of the soapy water from the gray tank (several times) to the black tank and drain in between transfers. All during this process, I keep the black tank flush running with fresh clean water and then fill and drain the black tank once all the gray tank water is gone. And then, of course, I put several gallons of fresh water into the black tank prior to using the "facilities" again.
This method has kept my sensors working perfectly for the past three years.
Ron
