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Thread: Odor from drainage channels

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    Odor from drainage channels

    I run two indoor pools at a gym. We have been having strong odors coming from the drainage channels that run between the pool deck and pools. I've been spraying a mix of bleach and water into the drains 2-3 times per week but the odors return withing a day or two. Does anyone have any suggestions for products or cleaning methods to eliminate odors from the deck drains?

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    Mod Squad JVTrain's Avatar
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    Re: Odor from drainage channels

    Do the odors smell like sewer gas? Typically there is a trap (s-shaped fitting) on the waste line as it goes to the main sewer connection to prevent sewer gases from coming up the pipes. Usually this is only a problem with drains that dry out over time but if that's the odor your smelling, could be a plumbing issue.
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    Re: Odor from drainage channels

    How long have you had the odors?

    Can you give us some chemical test results on your pools?

    What methods do you use to sanitize and oxidize the pools?


    What do the odors smell like?

    I'm suspecting you have some form of chlorine byproduct that is causing your issue but without more information there not much we can do.
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    Re: Odor from drainage channels

    The odors have been more prevalent since we installed a new ventilation system last fall; one theory a lifeguard has is that the drains are drying out more than they used to since the new system keeps the humidity significantly lower. It smells like sewage gas or stagnant water. I highly doubt the pool chemistry is affecting these odors since they are coming from the drains, not the pools. I use calcium hypochlorite to sanitize and here are the latest test results for both pools:
    Lap Pool
    FC: 2.0
    TC: 2.2
    pH: 7.5
    ALK: 90
    Cal. Hardness: 150
    Therapy Pool
    FC: 2.4
    TC: 2.8
    pH: 7.5
    ALK: 100
    Cal. Hardness: 150

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    Re: Odor from drainage channels

    That makes sense with adding the new fans - you are probably drying out the p-traps under ground allowing the sewer gas to pass through. I think people have put stuff like olive oil down there. It rides on top of the water and wont dry out, but I am not necessarily suggesting that.
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    Mod Squad pooldv's Avatar
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    Re: Odor from drainage channels

    If it is just the P traps drying out due to the climate control changes then you can just fill them with water when the smell returns. We had to that occasionally for floor drains at one of my jobs. I haven't heard the add oil trick to prevent or slow evaporation. Worth a try, it shouldn't hurt anything.
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