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When my tub drains after a bath, the water gets sucked out of my toilet. Why?

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That being said, the basin drains very slowly. I believe the stoppage in the basin drain is preventing the vent air from allowing the tub to drain properly and is forced to suck from the toilet…Could this be correct thinking? Thank you so much for your help…..
One Response to “When my tub drains after a bath, the water gets sucked out of my toilet. Why?”
  1. Blanca173 Said:

    Probably a stopped up stack vent. There should be a pipe poking through the roof above your bathroom. Climb up and shine a flashlight down it. Make sure it’s not stopped up with a bird’s nest or something.

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