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Thread: Purpose of these holes

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    May 2015
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    Purpose of these holes

    Sorry in advance for my lack of knowledge of what I am about to ask. Along the waterline tile I have 2 different holes and I have no idea what they are for. They stick out like a sore thumb but I'm sure they serve an important purpose.

    Pool built 1989
    Cartridge filter
    Auto fill feature

    First picture is on one end of the pool (not auto fill area) it has a female end. Is this purpose in case the pool overfills we attach a hose and empty?

    2nd picture is on other end of pool and the hole is near the autofill area (autofill is like toilet bowl type) what is the purpose of this hole that is cut out on tile?





    Thanks I advance for any info

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    n240sxguy's Avatar
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    Re: Purpose of these holes

    It would make sense for one to be an auto fill and the other to be an overflow. I don't know if that's what they are, but it could be.


    30K gallon IG vinyl. 1.5HP 2-speed Waterway Mustang pump. 600 lb sand filter. Polaris 280. Circupool SI-60+. TF-100

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    Re: Purpose of these holes

    To clarify the 2nd pic with the pool lid is where the autofill contraption is. About 12" down in the pool there is another hole which I think is the actual fill hole.

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    n240sxguy's Avatar
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    Re: Purpose of these holes

    May be two overflows. Odd that they are different sizes. At least they appear to be different sizes from the pictures. Can you manually operate the auto fill to verify where it goes? The hole under the water isn't a cleaner port or anything is it?


    30K gallon IG vinyl. 1.5HP 2-speed Waterway Mustang pump. 600 lb sand filter. Polaris 280. Circupool SI-60+. TF-100

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    Re: Purpose of these holes

    The 2 holes are different sizes. The one not near the autofill has a female threaded end.

    The other hole in the 2nd pic is a little bigger and has no thread. When we are in the pool and water is moving water goes in and then comes back out no pressure though just natural splashing in and out. I don't know if that drives the water level but looking at autofill diagrams online it seems like it wouldn't come from there. This is what I found online which doesn't lead me to believe that this hole is part of the auto level/fill, but if not I don't know what it is for http://i.ytimg.com/vi/BgggeAhcDa4/hqdefault.jpg

    When the pool was being re plastered water came out of the hole 12" down so I think that is where fresh water fill comes from.

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    Mod Squad YippeeSkippy's Avatar
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    Re: Purpose of these holes

    If you were to hold a hose up to the larger hole and run water into it, would you see it come out anyplace in your yard?
    My Amazon Smile for November12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
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    Re: Purpose of these holes

    We put a hose up to the hole and could not see it coming out anywhere. It almost seemed like it came right back out

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