Sometimes our two toilets (master bath and guest bath)percolate just like a coffee pot. The water fills the bowl to within 1/2" of overflowing. It sometimes needs to be plunged and other times the bowl will clear on its own. Does anyone have any solutions. We've checked the vent pipe, its clear. We even tried dishwashing liquid in the bowl that someone suggested. We do know our neighbors were having the same situation.
Thank you in advance for any suggestions you give. Calcats