Review on Happy Campers - Extreme Tank & Sensor Cleaner: Top RV & Marine Cleaning Solution for Unmatched Cleanliness by Russ Mashlan

Worked well as a temporary partial solution to reservoir sensor problems. But nothing replaces professional cleaning. Like most RV owners, I thought that emptying my black water tank was all the nasties that came out until I got a professional cleaning and discovered how much gross stuff was left in my tanks just below the dining room table. Table! Tip for mobile home owners: Even with full connections, only open the black water valve when the tank is at least 2/3 full. If 2/3 run out of water by the time you are ready to camp, simply fill the toilet with water until you are at 2/3 or more, then open the black faucet to flush the water to drain I close my gray water valve the day before camping so I can open it after draining the black water to flush the drain hose with gray water. Otherwise, if you opened the valve when you use the toilet, the liquids will leak out immediately, leaving solids (toilet paper and feces) in the tank. And then come the channel flies, whose larvae turn into worms and get more and more disgusting! (This only lasts a few weeks.) Have your aquariums professionally cleaned at least once a year if you use toilet #2! This product helps between professional cleanings. When using this, it's best to put it in a water-filled toilet before going on a trip, and the propulsion "squirts" it into the tank to help clean it up. Then empty the tank before setting up camp.