I'm living in a building of 6 floors, I'm at the 5th floor. I made a full renovation to my apartment about 8 years. Recently I began smelling a bad sewage smell from the bathroom (from drainage hole).
The thing I can't understand is how it's possible if I have a siphon that always keeps a high level of water such that it blocks the passageway of air...
It's driving me crazy and I don't know how to solve this issue.
Would appreciate a lot your advices,