Put at least five gallons in the tank after … Both had clogged up toilets. If possible, add several gallons of water to your black tank. CLOSE YOUR BLACK TANK VALVE. If you find that your RV black water tank has become clogged, then you need to remove the obstructions as quickly as possible.

Not putting enough water in the tank after emptying it. Your blackwater tank holds all that waste via a line that connects it to the toilet.
Use single ply paper.

Step 2: Wipe down the Line.

2.

Leaving the blackwater valve open.

I opened the black water tank, some liquid came down the hose, but the level of water … read more It is highly recommended that you read this entire page and watch the videos before attempting to remove your own blockage.

Clogged RV toilet holding tanks are part of living in an RV.

The pipe from the toilet to the black holding tank is clogged.

Let sit for 12-72 hours (the longer the better!).
I believe the problem was do to two things: 1.

Blockages in the waste tank can quickly turn into a backed up toilet, leading to sewage leaks, dirty water all over your floor, and eventually, expensive repairs.Getting rid of clogs should not be too difficult, and by following some simple steps, you should have the RV black water tank … The fix.

Through your RV’s toilet, pour an entire bottle of Unique Holding Tank Cleaner into the tank. For more detailed help, read this article I wrote about how to clean and flush an RV black tank.

3. Purchase the Plugged Tank … Unclogging your RV Holding Tank or Toilet.

As a good camper, you should always ensure that you are prepared for almost anything while you are out there camping.

However, dealing with a clogged RV toilet tank is very difficult if you don’t know how to unclog an RV toilet holding tank on your own. If you wish to throw caution to the wind and try it without the aid of all this information, at the very least watch this relatively brief instructional video. I poured boiling water into toilet, it didn't work.

Using 2 ply toilet paper, and the wife using lots of it. Scotts, 1000 sheet works just fine. WARNING: This procedure requires basic knowledge of RV Tanks!

The more water, the better, so fill up your holding tank as much as possible without making a mess. To ensure your blackwater tank is clean, follow the directions on the Rid-X box or powder cleaner of your choice.