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Marc, Plumber
Category: Plumbing
Satisfied Customers: 1126
Experience:  Plumbing heating & home maintenance contractor
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When I flush the toilet, the bowl fills almost to overflow.

Customer Question

When I flush the toilet, the bowl fills almost to overflow. After the tank fills, the bowl empties way below normal level and stays there. I tried a 6' snake and once I got it past an apparent small opening at 3' or so, it went all the way in with no resistance. I am stumped.
Submitted: 1 year ago.
Category: Plumbing
Expert:  Jed Noble replied 1 year ago.

Hello, my name is***** am a plumbing contractor. Your main line is probably partially backed mainline past the snakes reach. When the water builds high enough it starts a siphon and sucks the bowl clear because the vent in full of water and can't release the air lock. Do you have cleanouts outside that you know of?

Expert:  Jed Noble replied 1 year ago.

This could also be caused by a toilet that does not start a good siphon at the beginning of the flush. In the bottom of the you can usually see a 1/2" to 3/4" hole pointing into the toilet drain. At the beginning of the flush does water gush out of that hole?