I don't know what the problem is, but the first thing I would do is to make sure the tub drain (and all drains) have water in the trap. Traps can dry out. You could also try to plunge out the toilets to make sure they are not clogged. If these are not the problem, then it sounds like a venting problem, and you probably need a plumber to fix it. All fixtures vent through a pipe on the roof, and they can get clogged up by birds, debris, or other animals.
|