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  1. #1
    Join Date
    Mar 2014
    Posts
    3

    Default Water pulled out of downstairs toilet bowl when upstairs toilet is flushed.

    My father had a toilet replaced in his downstairs powder room recently. He noticed that the water in the toilet bowl dropped overnight. When he flushed the downstairs toilet, the water level in the bowl went back to normal.

    I had him flush the upstairs bathroom toilet while I watched the one downstairs. When he did this, I noticed the water level in the downstairs toilet dropped. I suggested that there may be an obstruction in the vent stack and that flushing the upstairs toilet was causing the suctioning of the water from the downstairs toilet.

    My father worked with the plumber that installed the new toilet and a contractor that went on the roof and cleaned the vent stacks. After the vent stack cleaning, flushing the upstairs toilet still suctions water from the downstairs toilet.

    Looking for advice on what to try next.

  2. #2
    Join Date
    Dec 2010
    Location
    Houston Texas
    Posts
    2,969

    Default Re: Water pulled out of downstairs toilet bowl when upstairs toilet is flushed.

    I'd look into re-routing the vent to the lowest toilet.

  3. #3
    Join Date
    Dec 2013
    Location
    Montreal Canada
    Posts
    211

    Default Re: Water pulled out of downstairs toilet bowl when upstairs toilet is flushed.

    Definitely a venting problem. Is the lavatory sink in the bathroom vented? It should be. Sometimes in the middle of a cold winter a vent pipe such as the vent for the lavatory sink in that powder room will have a place where the water collects and freezes and then blocks the vent.

  4. #4
    Join Date
    Mar 2014
    Posts
    3

    Default Re: Water pulled out of downstairs toilet bowl when upstairs toilet is flushed.

    Quote Originally Posted by bill shack View Post
    Definitely a venting problem. Is the lavatory sink in the bathroom vented? It should be. Sometimes in the middle of a cold winter a vent pipe such as the vent for the lavatory sink in that powder room will have a place where the water collects and freezes and then blocks the vent.
    Both upstairs and down stairs bathroom/powder rooms have lavatory sinks which are vented through main stack as far as I can tell. Down stairs sink drain has been cleared. Will take a look at the upstairs sink drain. Thanks for suggestion.

  5. #5
    Join Date
    Mar 2014
    Posts
    3

    Default Re: Water pulled out of downstairs toilet bowl when upstairs toilet is flushed.

    Quote Originally Posted by MarkRakowski View Post
    Both upstairs and down stairs bathroom/powder rooms have lavatory sinks which are vented through main stack as far as I can tell. Down stairs sink drain has been cleared. Will take a look at the upstairs sink drain. Thanks for suggestion.
    Roto-rooter contacted to thoroughly clear vent stack. Problem resolved.

  6. #6
    Join Date
    Dec 2010
    Location
    Houston Texas
    Posts
    2,969

    Default Re: Water pulled out of downstairs toilet bowl when upstairs toilet is flushed.

    Thanks for the update

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