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,
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