1st of all use logic. That is not a term for some fancy thing, Put 10 lb of ice in your tank everytime you dump it and add some water. Drive furiously for 10 min, thus sloshing the icecubes around and breaking down the solids in your blackwater tank. It's very cheep and will stop stink in it's tracks or whatever stink does. Use your toilet for what it was designed and if you want add 1/4 cup of Aqua chem to drains and toilet. I can guarantee this method will work having owned TTs for the past 28 years and using the exact same method.