I used the geo method and then switched to mixing about a pint of Pinesol and a pint of SuperClean after emptying the black tank until the Goshen rally and bought the Blue Streak Dispensing system. After running out of the Blue Streak solution, I mixed solution of 50% Pinesol and 50% SuperClean to fill the container and since 04Dec, we've have very good luck with it. So far when I check the sensor panel they will not read empty, but reads 1/3, which is what they read when we got the camper new and there had never been anything in the tanks but clear water put in by the dealer. We also do not put paper in the black tank. When I empty the black tank it empties with very few lumps and when the tank flush is activated it only takes about a minute for it to run clear. Unless something changes, I will continue with the 50-50 solution of Pinesol & SuperClean in the dispenser. Cheaper than the geo method also.