There is a lot of different RV holding tank chemicals available to use for your system. The chemicals available today are much better than the old-school methods of cleaning holding tanks. In previous years, many RV owners would use cleaning products such as Lysol and Pinesol. Neither option is good to use because they will kill the good bacteria that is needed to break down solids in the black water tank. In addition, these chemicals will eat away at seals and clean away lubrication wanted inside the tank.
It is best to use approved RV holding tank chemicals. These chemicals come in liquid form and are biodegradable. Some black water treatments come in a container with its own measuring device, while others come in biodegradable packets that can be tossed right into the tank. Aquachem by Thetford is one example and a popular option that also includes a deodorant. This can be used to help control odor in the grey water tanks, which can develop over time from water coming from the shower, kitchen and bathroom sinks.
The Thetford Tissue Digester will help breakdown toilet paper in the black water tank. However, it is still a good idea to use an approved RV toilet paper that will easily breakdown on its own.
Other suggested RV holding tank chemicals include:
Using proper RV holding tank chemicals will help effectively clean the holding tanks without damaging any of the seals or other components of the system.