Our toilet started to bubble up when we hit the pedal to flush it. What would cause this to happen? One we plunge It it seems to improve for awhile but not a long time.
Black tank vent is getting plugged so tank is venting thru toilet when you flush
Tank level high blocking off bottom of vent line Vent line has dropped down inside tank and is getting blocked Vent line is blocked due to poop pyramid buildup inside tank Vent line is blocked due to birds nest/debris inside at roof line.
Vent line is blocked.......you get to figure out what is blocking it