redfernclan
Senior Member
If your black tank is directly below the toilet and you can see stuff after dumping the tank, fill it half full, get a stick and give it a stir. I have a plumber buddy that lives out of his RV 3/4 of the year and he told me this trick. Problem is not enough water. He also said the first thing he does after dumping is run about a gallon of water into the tank. Just enough to cover the bottom of the tank under the toilet. Other wise the first "dump" my land on dry tank bottom and kind of seals itself. More water is your friend.