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Hi.
I’m building my house and installing a greywater recycling system.
I would like to know if I need to install odor traps on the shower drains. We live in a tempered Mediterranean climate.

Thanks

Greywater plumbing odor   shower
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  • Ignacio Joannon
    Thanks Laura. I don’t have a standard plumbing neither need to follow any codes. I just want no odors from the shower drain. From your answer I understand that if we operate the system in the right way, there will be no odors there. I have no prior experience with graywater so I was not sure if there would be odors from the graywater tank that could reach back to the shower.
  • Laura
    Sorry I missed your follow up comment. If you have a tank there could be odors, so be sure to vent the tank!
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Hi,

Greywater systems typically have a diverter valve installed in the regular plumbing, which has traps and vents. If your home has standard plumbing, with traps and vents, you will divert after the trap and vent for each greywater fixture.

However, sometimes it’s not possible to do this, or the home doesn’t have conventional plumbing, in which case you may divert greywater directly from the drain line of the fixture without a trap. (This is not compliant with most greywater codes, fyi, permitted systems need traps and vents and for the diversion to occur after them.) Keep in mind that the function of a trap is to prevent sewer gasses from entering the home. But, if the fixture is only connected to a greywater system, and not the sewer/septic, then there are no sewer gasses to be protected from.

Hope this makes sense.

 

 

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I lived with a simple greywater system for shower, where there was no P-trap, and occasionally little frogs would climb up pipe and hop into the shower!

  • Laura
    That sounds cute! But you bring up a good point that the water trap keeps some critters out :) A backwater valve on the line could also work to keep critters from crawling up the pipe.
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