Hi, I am new here at the forum though I have accessed Herb’s Place for a long time.
Here goes. Our basement drain backed up a few times last fall, we cleaned up, then had a pro. co. come in to snake out to the city water. Just a bit of calcium buildup, no roots, I saw the camera run. House is 40 yrs. old. He said there is a bow in the pipe under the washer, probably from years of settling.
Since then, only when the first wash water drains into the tub there is a strong sulfer smell. Subsequent drainings have no odor. It is not related to any other drain use in the house.
Any ideas why the smell?
Thanks,