: I have a stall shower that every so often it smells like a sewer. I've used bleach on it, it works for only so long. There is water in it so I don't think it is evaporating.

My guess is your vents aren't up to snuff.
Somewhere, gasses are pressurizing your drainage system and the shower is the easiest way out.
I believe a vent just before the shower trap would solve the problem.

Good health, Weogo