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Thread: What are the two holes in the skimmer

  1. #1
    Member Krickett's Avatar
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    What are the two holes in the skimmer

    I have a skimmer with two holes in the bottom. One I know is the regular suction to the filter, but what is the other one for. The problem is that a rock dropped into that hole. I can see the rock and can partially get some screwdrivers on each side but can't get it out. So actually I have two questions:

    1) What is second hole for?
    2) Is there a way to get a rock out of it (i.e. reverse water flow, etc.).
    21k gal, plaster IG pool with spa
    Main - 1 skimmer, 1 main drain, 3 returns, Spa - 1 drain, 4 returns
    WhisperFlo Dual Speed WFDS 1.5 HP pump
    S310S 30" sand filter
    Polaris 360 pressure cleaner

  2. #2
    Senior Member polyvue's Avatar
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    Re: What are the two holes in the skimmer

    Quote Originally Posted by Krickett
    I have a skimmer with two holes in the bottom. One I know is the regular suction to the filter, but what is the other one for. The problem is that a rock dropped into that hole. I can see the rock and can partially get some screwdrivers on each side but can't get it out. So actually I have two questions:

    1) What is second hole for?

    Could be connected to the main drain, another skimmer, a bypass inlet (if the latter, there will be an inlet under the water line close to this simmer), or... nothing, in which case that's what you should do with it. On my skimmer, the builder just dead-ended into concrete/rubble, so it has no useful function. (Guess they could have screwed a plug into it, but that would've cost more money!)

    2) Is there a way to get a rock out of it (i.e. reverse water flow, etc.).

    Do you see that a rock is down in the throat of a PVC pipe connected to the skimmer? or just beneath the connection? Might be difficult to blow it out if it's connected to main drain.
    14,555 gal in-ground 16'x29' white plaster Pool w/spa (2007); Goldline Aqua Logic AQL-PS-8 control w/Aqua Cell 15 Salt Water Chlorination (SWCG); Hayward TriStar 1HP (1.85 SF) main / 1.5HP (1.60 SF) spa pumps; Hayward Swimclear cart filter C4025, ColorLogic LED lights; Tankless SP-18-4 electric heater; Polaris 280 cleaner.
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  3. #3
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    Re: What are the two holes in the skimmer

    Could you use a wet/dry vac to try to get the rock out?

  4. #4
    Member fordsbyjay's Avatar
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    Re: What are the two holes in the skimmer

    The second hole is a blank. When I replaced my skimmer last year there were two holes on the bottom. I plumbed into one and put a plug in the other. It sounds like yours is the same as the rock is just sitting there and no went down the pipe. BTw, the original one was the same way as well.
    19000 gallon inground fiberglass pool
    Hayward Pro Series Sand filter S244T 62 gal/min
    Whisper Flow WFE-2 / 011511 1/2 hspr pump
    Aqua Rite Pro SWG, T9 cell for 25000 gal

  5. #5
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    Re: What are the two holes in the skimmer

    During pool school I was told the other whole is for construction reasons.

  6. #6
    Senior Member In the Industry
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    Re: What are the two holes in the skimmer

    Quote Originally Posted by fordsbyjay
    The second hole is a blank. When I replaced my skimmer last year there were two holes on the bottom. I plumbed into one and put a plug in the other. It sounds like yours is the same as the rock is just sitting there and no went down the pipe. BTw, the original one was the same way as well.
    That may not be entirely true. The forward hole is sometimes plumbed into the main drain. Unless of course you have a main drain line coming up at the equipment pad. Or, (in the case of two skimmers) it could go to an equalizer line that would come out just below the skimmer throat. This prevents the skimmer from running out of water in the event that your water level drops, and the skimmer cannot get the water it needs thru the skimmer throat.
    Factory Warranty Station for:
    Jandy, Pentair, Sta-Rite, Raypak, Polaris,
    and Paramount pool cleaning systems.

  7. #7
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    Re: What are the two holes in the skimmer

    Equalizer line or main drain are the most common uses (the most common non-use is to plug it and have it do nothing, in that case the plug is usually applied from the bottom when installed).

    However, the company for which I work uses the extra line in another way, we plumb a reserve line in on installation. This line is run to the filter pad and stubbed up next to the live line (it doesn't get plumbed into the system). If anything ever happens to cause the live line to fail, we can utilize the reserve without having to bust up the deck or dig up the yard

    If you have the equalizer line, you can force water or air through the poolside port to try to dislodge the rock. By the by... you really should find out where that pipe goes and what it does
    Luv& Luk
    -Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

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