we built a house 6 years ago on a slab foundation with a septic/treatment plant. From day one we have had trouble with our master bath shower drain and treatment plant. we have sewer gas smell coming from our shower drain. it is only coming out of this drain and the ptrap is holding water. we have measured it at different times throughout the day and every time it measures 7 inches. A year ago, the floor was busted up and it was discovered that the shower was not vented. The plumber vented it and patch the floor. A year later we still have the odor. It went away for a while but returned. When we turn the shower on, the smells immediately goes away, but within a few hours it is back. It is a separate shower, no tub, that is used at least 3 times a day. The material is man made marble, don't know if that has anything to do with it or not. currently the shower floor has been busted up and there is not a leak or mold growing. please help.
Finding those odor producing drain areas can be so frustrating. It may not be in the drain at all, but the water bypassing the drain plumbing "somewhere" and staying wet long enough to grow bacteria and odor?
I once rented a basement art studio in an old building. It had a floor drain tucked away in it, and I kept thinking a random foul odor was coming up from that. Poured bleach in it regularly, but never really helped much.
It appeared there was probably some leak between the brick walls, and when it stayed wet from rain or drain use...it would start to stink down there again. Really nasty smell, like wet or moldy clothes/diapers? Only thing that worked for me was to move out. Sorry, not much help.
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