Happy Campers RV Black Tank Cleaner - Powerful Sensor & RV Holding Tank Cleaner, Removes Bio-film, Grease, Mold, Stubborn Odors, Mineral Deposits, Films & Build-Up, Tank Reset Solution

Wow, really cleaned the tank.

Used this whole container in our black tank when we took our camper home from the seasonal. Drive was about an hour and when we emptied the tank, the amount of nasty stuff that came out was amazing. This was after we spent an hour with a hose spraying down the toilet and filling the tank 3 times and emptying it. The amount of nasty crap still in there was amazing. May do this again next spring before we bring it up to our seasonal too and see if it cleans any more out.

Worked well as a temporary partial solution to holding tank sensor problems. But no substitute for a professional cleaning, Like most RV owners, I thought when I drained my black water tank all the nastiness drained out - until I had a professional cleaning and discovered how much disgusting stuff had been lingering in my tanks just under my dining table! Advice for RV owners - even if you have full connections, don't open your black water valve until your tank is at least 2/3 full. If it's not 2/3 by the time you are ready to break camp, just add water to the toilet until you get to 2/3 or more and then open the black water valve to drain. I close my gray water valve the day before breaking camp so that I can open it after draining the black water to flush the drain hose with the gray water. Otherwise, if you have the valve open, when you use the toilet, the liquids drain out immediately leaving the solids (toilet paper and poop) in your tank . And then come the sewer flies whose larva turns into worms and just becomes more and more disgusting! (This only takes a few weeks.) Have your tanks professionally cleaned at least once per year if you use your toilet for #2! Between professional cleanings this product will help. When using this, it's best to put it in the toilet with water before you head out on your journey and the drive will "slosh" it around in the tank to help with scouring. Then drain the tank before setting up camp.

I went home for Thanksgiving in my car, so I put this product in the black water tank, filled it full and left it. Upon return, I drained the tank and there was no more sewer smell!I'm going to California in my car in the spring, so I reordered the product to use while I'm gone.I highly recommend this product!

I have used this twice over several years typically on our last leg of a trip following the instructions of using hot water. The black tank is 50 gallons and after dumping then flushing, the water is clear during the flush. We use our motorhome 10 months of the year and do not regularly flush & never had any issues. If we were part timers I would do it every year.

Followed directions and used hot water to dissolve first, even let it soak double the recommended time (48hrs). Drained it and saw VERY MINIMAL build up removal. $40 down the toilet. Granted it does say for best results drive on a windy road so it can slosh the sides but that was 100% NOT an option. Besides where I needed it to work wasn’t on the sides of the tank rather the BOTTOM where it exits the tank at the gate valve. WAY over priced for 1 treatment… maybe if it was for 4!

It works OK ,but in no way is it worth the price. You can get better for less.

I let my son's buddy live for over a year in my 1978 fifth wheel. He did not follow instructions about adding the weekly pod treatments. He used a lot of toilet paper. Then he left the place in a mess and didn't empty the tank before he left for weeks, saying he would be back to clean it out. I finally went in and found that the holding tank was in an awful state. I tried cleaning it with Dawn dish soap, I used the pods, I rinsed and cleaned it for days. You could still barely stand to be in there. Then I bought this stuff and followed the directions to leave it standing in there for at least the 72 hours. That worked! After that, I've continued to clean it out regularly and it is back to normal. This was definitely a wise move. Recommend!