Toilet Bowl Mysteriously Drains

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    • #273946
      Avatar photoMasterPlumbers

        I have an upstairs toilet for which the bowl will mysteriously drain over the course of 4-6 hours.

        I suspect that something in my venting is causing the the bowl to siphon dry but I am unsure about how to test this.

        The flange seal does not leak and I have replaced the toilet. This toilet is situated close to the stack and where the stack exits the roof. A tub and sink share the same drain. The attached sink has a supplemental vent that exits the roof within 10 feet of the stack.

        I have an identical toilet situated downstairs and connected to the same stack and drain – this one works properly.

        Any ideas ?


      • #288885
        Avatar photoSylvanLMP

          Oscillation can cause this kind of phenomena.

          Do you possibly have a down draft situation?

          You could also have a mop string or dental floss or some other absorbent materials acting like a wick causing capillary action.

          The easiest thing is to auger this toilet 1st THEN if nothing is found
          check your vent location for possible down drafts.

        • #288886
          Avatar photoGuest

            Hi Sylvan,

            Thanks for the feedback.

            There is nothing in the toilet. It is brand new and I checked its trap before I installed it.

            I don’t know what a down draft situation is – could you explain what is is and how you detect it.


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