I use the Geo method also. I also dump a 5 gallon bucket of water down the toilet before I dump. The other thing I do, is hook a hose to the "cleaner" connection and make sure it does not have a limiter on it and spray the black tank for about 30 minutes. I will close the black tank valve for 5 minutes at a time to let the Tank fill with some water and dump again. Just make sure you don't get disturbed and forget what you are doing. lol. Craig
Finally completed all State visits in August 2011 with a trip to North Dakota.