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  • Nov 14, 2005, 12:04 AM
    Large burping bubbles from toilet when flushed
    Hello everyone, I have a rental property I have been working on and have a problem with the toilet. When the fella who was living there moved out he said that the toilet was not flushing properly, he was right. It would swirl very weakly and every now and then it would barely flush all the way. It was old and ugly so I opted to just get a new one. I bought a good brand name, glazed trapway toilet and installed it. Everything goes down fairly decent but as soon as you hit that flush lever a large bubble bursts up and sometimes splashed up on the seat. The air seems to come from the small hole at the bottom on the front side.
    I recently had the clay pipe main line cleaned out and can stick a garden hose into the clean out in the yard and push it to the point to where it should be reaching the sewer. I got up on the roof and stuck the hose in the vent and can see it go past the main line clean out in the front yard. Everything seems to be unobstructed, even the pipe under the toilet is clear. Even though everything seems to go down fairly decent could there be something between the main line and the pipe under the toilet (the part you can't see)?
    Any suggestions? Bad toilet maybe?
    It may not matter but before I took off the original toilet I replaced the water supply valve behind the toilet, it was bad but didn't help the initial problem very much.
    Thanks in advance.
  • Nov 14, 2005, 05:18 AM
    Good morning Scott,

    Ordinarily when a toilet "belches" it's a sign of a partial clog downstream of the toilet but I don't think so in this case. With a clog the "bubble" comes back through the trap but in this case it is forced through the jet hole.
    This indicates that the air trapped between the tank on top and the trap in the bottom is being pushed out as a "belch" through the jet when flushed. This is not normal and I would attempt to get the store to replace the bowl, (you don't need a new tank) under warranty. Good luck, Tom
  • Aug 10, 2008, 09:10 AM
    Could this also be the seal between the tank and the stool?
  • Aug 10, 2008, 10:23 AM
    Milo Dolezal
    I agree with Tom. It is probably toilet design that causes it to splash... What brand / model of toilet did you get?

    It should have nothing to do with the wax ring. If the wax ring was the problem then it would leak around the base when toilet is flushed or it would be sluggish in emptying water from the bowl...
  • Oct 30, 2011, 10:51 AM
    My toilet only started bubbling after I replaced the system with a Fluidmaster. The flap now lowers too soon, and the toilet bubbles after flushing. So. . There's no new clog, the seal between the toilet and floor / tank to bowl has not been altered.
  • Oct 30, 2011, 11:42 AM
    Milo Dolezal
    Projecto, you are talking about 3 different things in your post:

    1. Fluidmaster stem is fill valve. If your toilet tank is filling up to the fill mark than fill valve is OK
    2. Flopper releases water from tank to the bowl. If it lowers too soon than it is Low Flush Flopper. If there is a styrofoam on its chain than adjust it lower so it keep flopper open longer. If you don't have low flush toilet than get regular Korky's flopper
    3. Bubble in the toilet are not related to either Fill Valve or Flopper. It is related to drainage. Your toilet waste pipe or vent may be clogged and are in need of service.

    What kind of toilet do you have ? How old is it ?

    Back to you. Milo
  • Oct 30, 2011, 12:59 PM
    Hello everyone! I started this thread 6 years ago and wanted to confirm that the problem WAS a bad toilet (they indeed can be bad when new). I replaced it with a different one and it has worked fine since then.
  • Oct 30, 2011, 06:00 PM
    Since the toilet did not bubble until the Fluidmaster was installed, I have to rule out
    Clogs and/or faulty seals beneath the tank or commode. After all, it hardly seems
    Likely that a clog would develop during the 10 minutes it took to install the FluidMaster, right?
    Or that a seal would suddenly start dissolving during the same 10 minutes. . Correct?
    So. . Either the Fluidmaster can't handle the water pressure (I tried turning the water knob
    Way down) or the FluidMaster needs an adjustment that I don't know about.
  • Jul 11, 2012, 02:14 PM
    Here's a thought. Replace the Fluidmaster with a different brand and when it does the same thing pay more attention to Milo. Wax doesn't dissolve like you mentioned and if you had bothered to read the Fluidmaster instructions you wouldn't be asking about adjustments.
  • Jul 11, 2012, 02:45 PM
    Hi 5866 and Welcome to The Plumbing Page. At You're responding to a 7 year old dead thread. Look in then upper left hand corner of the first post form the date in the first post before you post, Thanks, Tom

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