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I have a bathroom with a bathtub, toilet, and sink that are all very, very slow to drain. When water drains out of the toilet, it backs up into the tub, and vice-versa.

Here's what the setup looks like.

        Sink   Toilet   Tub
----------+------+----+--+
 < Flow of water <    |
                  Clean out

To the right of the tub there is nothing.

Here's what I've tried:

  • I had someone (not a professional) auger the clean out and remove some solids (looked like food from the garbage disposal and soap scum).
  • He removed the toilet, took a hose, and sprayed water into the drain and the water went through the drain pipes no problem. After he put the toilet back on, the problem seemed to be a little better, but still noticeably slow.
  • Putting some enzymatic stuff in there over the course of a couple weeks
  • Putting Liquid Plumber down the tub drain and sink
  • Putting bleach down the tub drain and sink

What else can I do (short of calling a plumber) to troubleshoot this?

  • Can you get to any inspection covers downstream of the sink? – Rowland Shaw Jan 2 '15 at 19:46
  • No, unfortunately. The clean out that is under the bathroom was actually put in by the guy that augered the pipes because there wasn't one there. – Ben Jan 2 '15 at 20:23
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Clearly the restriction is left of the sink in your diagram. One more question you could consider is whether this is an installation deficiency (problem has always existed) or whether the drain was working properly at one time and the situation has become worse.

I would suggest using a video inspection camera to be certain about the location of the restriction and perhaps what is causing the restriction. Here is a rental unit that may be available in your area. Or here is a contractor that could provide this service. It would be best to try to clear debris before the blockage prior to a camera inspection.

  • I suspect it's an installation deficiency. When I first moved in, the drainage was slow, but not to the point that it was a problem. Then it got progressively worse. – Ben Jan 2 '15 at 20:28

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