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I've been doing this a long time and I wouldn't describe any sewer smell I've smelt sat rotten egg. Can you think of another way of describing it or is it really that sulfur like?
Well perms smell of ammonia. And urine contains ammonia does that smell like ammonia
You can do a smoke test on the sewer system. It involves plugging the sewer main and then climbing on roof and capping the vents except one. Then putting a gopher smoke bomb in a shop vac and using the blow feature to blow the smoke into the sewer system
It can come from any drain OR vent line in the system and if a vent runs up the wall and is cracked then it will stink