If you’ve ever had a clogged RV toilet, you know that the best way to tend to it is to prevent clogging in the first place! But, with that obvious statement aside, we all know that solid waste and paper can sometimes create a clog. For this reason, it’s a good idea to know in advance how to unclog an RV toilet before it happens.
That’s the purpose of today’s post…preparation!
So, whether you’re faced in the future with a pyramid plug like this —>💩 causing a problem in your toilet bowl, black tank, or sewer line, we’re going to arm you with the knowledge to conquer the 💩!
Glove up and let’s go!
Where Do RV Toilets Clog?
RV toilets are most likely to occur in one of four locations.
Blade Valve
Some clogs occur right at the blade valve located at the bottom of the toilet bowl. The cause of this is generally either too much “stuff” (solid waste and toilet paper) sitting in the bowl itself, or too little water in the bowl before that “stuff” was added.
Transfer Pipe
An RV toilet may also be clogged in the pipe or tube that leads the toilet contents from the toilet down into the black tank. The cause of a clog in this location is likely similar to a clog at the blade valve – too much “stuff” and/or too little water!
Black Tank Inlet
A clog may be located at the outlet/inlet to the black tank itself. In other words, just before the waste and paper exit the pipe/tube and drop into the black tank.
Black Tank
A clogged RV toilet can also be caused by a backed-up black tank. If your black tank overflows, you’ll have a clogged toilet because the waste won’t be able to descend into the (full) black tank.
An overflowing black tank is generally caused by either not dumping your black tank in time or not dumping it completely.
If you’re relying on your RV holding tank sensors to tell you when to empty your black tank, you’ll want to make sure that they’re working properly.
Now, tank sensors are notorious for delivering false information. But one thing you can do to help is to clean your RV tank sensors.
And no matter how meticulous you are about keeping your RV sensors clean, if you’ve been using your RV for years, you’ve very likely got a build-up of struvite (which can prevent tank sensors from reading correctly), requiring a power-washing of your black and gray tanks.
What Causes RV Toilet Clogs?
The answer to this question depends to some degree on the location of the clog. But there are a number of things that can lead to an RV toilet clog.
Too Much “Stuff”
As we noted above, excessive “stuff” in the bowl can cause a clog at the blade valve (where the toilet opens to drop the contents below).
The same thing can occur (for the same reason) when you flush the toilet and too much “stuff” enters the pipe/tube that leads to the black tank. The waste & paper can get stuck in that tube, unable to drop into the black tank.
Tank Build-Up
An RV toilet clog can also occur when waste and paper build up inside the tank itself. When this occurs, (and it’s very common), it’s generally because the waste and toilet paper aren’t able to break down sufficiently in the tank.
In fact, if you’re not using any product to help break down waste, this is a likely culprit of your RV toilet clog.
Cheryl
Saturday 24th of December 2022
Hi,I live in my rv,I’ve been told so many different answers on what not to do and what to do,my toilet gets clogged I’ve tried everything!!!!! A no go….. I use treatment so stuff does not clog,I live alone so not much waste ,if u know of anything else I can try,it would be so appreciated the best product to use to hung clog it,I’ve spend so much money on different ones.thanks for ur time
TheRVgeeks
Sunday 25th of December 2022
Hi Cheryl. Sorry to hear you're having trouble with your RV's toilet and/or black tank. We're going to assume from what you've said that it's the black tank that's clogging (i.e. you're having trouble with dumping the tank... not everything is coming out?). Our guess would be that there's likely one of a couple of things going wrong:
You're not using enough water when you flush the toilet. RV toilets are definitely different than what most people are used to, so we'll try to be delicate describing things here. If you're just doing #1, you can go into the bowl and then flush, using enough water to rinse the liquid waste off the walls of the bowl. But if you're going to do #2, you should first fill the bowl up with enough water that everything will float, and then be sure to use plenty of water while flushing to get it all down. That will ensure that you're putting enough water into the black tank, along with the solids... which will help when you dump. You need enough flow to whisk the solids out of the tank. Be sure you're not using too much toilet paper. Even the "RV safe" stuff can cause clogs. If you're the type of person (not saying you are, LOL!) who wraps their hand up with a huge wad of toilet paper in order to wipe, you're going to cause problems. Many people keep a small, covered garbage can in their RV's toilet room/bathroom in order to put the toilet paper in it, rather than flush it. As a test, you could try that for a while and see if that makes a difference. If your problem goes away after a couple of dumps, you have your answer... use less paper or don't flush it any more. Lastly, be sure that you're not leaving your BLACK TANK VALVE open when you're hooked up. You can leave your GRAY TANK VALVE open when you have a sewer connection, so you don't have to worry about dumping it (since it tends to fill up more quickly... and many people don't like having to worry about running water at the sinks or in the shower... see our post about leaving the gray tank valve open). But if you do that with the black valve, you're allowing all the liquids to run out, leaving the solids behind. Eventually, you'll end up with what's called "pyramiding"... and you can guess what that looks like! 💩If you've been doing any of the above incorrectly, you may need to treat the tank to try and dissolve/digest what's in there. The two products we think are the best for that are Happy Camper Extreme and Unique RV Digest-It Tank Cleaner. Fill the black tank with water and a heavy dose of either of those, let it sit for as long as you can (at least 12 hours if possible!), and then dump it all out. If it doesn't seem to improve things, do the same process again.
If THAT doesn't do it, then you may need to call in a professional waste tank cleaner to bring in the "heavy guns" to get out the blockage. Once clean, abide by the suggestions above to KEEP it from getting clogged again.
Good luck!
Revbucco
Sunday 16th of October 2022
We lived for over 15 years in Latin America. Our first introduction was being told ‘don’t flush the toilet paper!’ Turns out they use smaller diameter drainage pipe and any paper in the pot will cause stoppage. All paper had to be thrown into a trash container in the bathroom with a lid and disposed with the trash.
When we owed our first 5th wheel we had a huge problem with our black tank and it took hours to finally clean out the black tank and get things flowing again. We decided to revert to our Latin America experience. Saves money as we don’t have to purchase RV toilet paper and we can go longer between flushing our tanks. We reuse the plastic garbage bags you get at the grocery park store and take it with us each day when we head out and throw them in the campground dumpster. We also save money on not having to purchase additives to literally throw down the drain to aid in decomposition.
Best decision we have ever made.
Dennis Johnson
Saturday 15th of October 2022
Always, before going #2, add a few inches of water to the bowl. Saves a lot of grief and helps with "cling-ons".
TheRVgeeks
Saturday 15th of October 2022
Now that there is what ya call good RVing advice. Thanks Dennis!