We've been having this problem returning for a few months now. We have a house on a concrete slab with a separate tub and shower that every 3 weeks or so has an odor that seems to not go away. The odor is only in our shower and nowhere else. We've bought MULTIPLE products to flush and clean the pipes, but nothing seems to work. Any suggestions?? :confused:

We've bought MULTIPLE products to flush and clean the pipes, but nothing seems to work. Any suggestions
Did you try snaking the drain line out to remove the rotting hair and grease?
And did you pour a few large pans of boiling water down the drain to loosen up and flush out the remaining crud? Regards, Tom

Do you regularly use the tub to keep water in the trap? If not, periodically run a faucet for 30 seconds to flush out and refill the trap.