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Question DetailsAsked on 3/13/2015

What causes the toilet water to slowly go down in the bowl?

The toilet fills up when first flushed but then over the next 24 hours the water level in the bowl goes way down.

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3 Answers

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Here is a prior basically identical question with response which should answer your question:


https://answers.angieslist.com/Why-to...

Answered 4 years ago by LCD

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In addition to the technical causes listed in the prior response, heavy winds can also cause the level in traps (including toilet bowl) to go down as the wind blows across the sewer vent pipe on the roof and causes a partial vacuum, which pulls a bit of water out of the trap with every strong gust. This is why you see the water bouncing up and down a bit in the toilet bowl in strong winds. Only you get up to around 40+ mph typically it can commonly creatae enough suction to actually pulldown enough water to allow sewer gases to come up through the trap.

Answered 4 years ago by LCD

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here are a couple of prior responses to similar questions which might help you -


https://answers.angieslist.com/Why-Wa...


https://answers.angieslist.com/Why-to...

Answered 4 years ago by LCD




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