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Some plumbing work was recently done in my building, and as part of this they changed some pipes under the sink. Ever since I have noticed that the drains tend to smell, particularly when draining the water from it.

There is a main bowl on the left (see pictures below), and a small bowl on the right, and an overflow drain runs out of the main sink, joining the outlet for the small bowl underneath the sinks. I have noticed that the pipe going from the overflow to the drain (A) has a low point below the level at which it drains, which I think means water and dirt will pool and sit in this low point rather than draining freely.

Is this likely to be the cause of the smell, and should I just shorten this pipe so that the flow is uninterrupted (so that the lowest point is the outlet end)? enter image description here enter image description here

  • Just curious what country this is in. I've never seen fittings like that or an overflow on a kitchen sink. – JPhi1618 Mar 14 '18 at 15:50
  • @Jphi1618 Sweden, but I'm sure out kitchen sinks had them growing up in the UK – rg255 Mar 16 '18 at 7:34
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There would certainly be no problem shortening the flexible pipe some so that it does not collect water at its low point. Before cutting though make sure you comprehend the type of fitting used to join that pipe to the right side sink drain basket. (There may be a need to have new parts if a portion is not re-usable).

It is not possible to tell from your picture if there is a properly installed P-trap in the main drain line. Note that the P-trap also keeps some water to seal the drain off so that sewer gas does not come up into the sink. If that trap is installed incorrectly or of there is not a properly installed vent pipe on the down flow side of the trap there is a possibility that the bad smell that you are experiencing may not come from the overflow pipe.

So I would first suggest to shorten the overflow pipe and then clean/sanitize the drain system, including the overflow pipe. Then you can re-evaluate to see if there is still a bad odor in the drains. If so you would then need to have the apartment folks come back and correct the possible trap problems.

  • thanks - I'll check for the existence of a p-trap when I get home! – rg255 Mar 14 '18 at 13:47
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    That is some unusual plumbing. A photo from a little further back would be helpful. I agree with Machael that the overflow pipe should not hold any water as it would not get flushed out on a regular basis and could stagnate. – Alaska Man Mar 14 '18 at 17:09
  • It's apparently set up to add a dishwasher to the system – rg255 Mar 16 '18 at 7:35

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