Dear Forum Members,
Believe it or not I do have a 13 story building where the whole sewage system goes down to the subcellar. Yes, there is not gravity system. Well, this is not the problem but what worries everyone are the terrible unpleasant odors coming out from the floor drains. The water seals get lost everytime someone flushes the water closets. I am being doing some research and I have found that each floor vent before connecting to the vent stack makes a kind of inverted siphon.
Could this be the possible reason why the building smells so bad?
Any entry or point of view will be highly welcome. The main question is how could I solve this problem?