[PT RV`er]

I backwash both tanks after every trip. My wife has a very sensitive nose and she says she can smell the difference if it`s not washed out. I`ve found that if I don`t backwash the black tank, I get these little flies inside the tank. I`m not sure how they get in there, but when you step on the pedal to open the seal, they fly every where inside the bathroom.