Cleans sensors and lubricates seals and valves. People also ask, can you use regular rid x in an rv? How Does Bio-clean Stack Up Against Rid -x - Youtube Ridx is for septic tanks not rv holding tanks. Does ridex work in rv tanks . The only effective use of this device we found over time and testing is to clear a blockage in the black tank without making a mess! It is made from natural bacteria and enzymes, namely cellulase, lipase, protease, and amylase. Holding tanks are not septic tanks. The typical rv black tank is anywhere from 30 gallons to 50 gallons in capacity. Not only has it eliminated the smell in our tanks from fumigating our rv when we release them but it’s also all organic. Rv's have holding tanks and we do not flush down food, grease, oils, bleach, etc down the toilets in rv's. It works efficiently in regulating odors coming from the holding tank of your recreational vehicle. It can also be utilized in the kitchen sink to breakdown oils, gr...