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Thread: Skimmers each have two holes, one plugged

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    Skimmers each have two holes, one plugged

    My inground pool has to skimmers each with two holes. one hole is always plugged and the other sends water to the filter. What are the plugged holes for? Also they are looking old and rotten, should I try and get them out and replce them?
    Also one skimmer seems to be dominate (pulls water alot harder then the other; is this a problem?
    Redding Connecticut, Wagner pool 50k gal. cement. DE filter requires 9 pounds of DE to restore. 9ft deep kidney shaped.

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    kenmar's Avatar
    Join Date
    Apr 2009
    Schnecksville, PA

    Re: Skimmers each have two holes, one plugged

    I have the same thing.
    My pool builder told me the plugs are swapped when the pool is closed.
    The currently plugged hole drains into the ground, it is used as an overflow during the winter (should a significant rain or ment occur).
    20'x40' / 30,000 Gal / In Ground / Vinyl
    Pentair FNS 48 DE Filter / Pentair Challenger 1.5 HP Pump
    Jandy Lite2 400k BTU Propane Heater / Dolphin Dynamic cleaning robot
    TF-100 Test Kit / BBB
    Creator of SimplePool (BBB Friendly Android App)

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    Join Date
    Sep 2007
    Lafayette, Louisiana

    Re: Skimmers each have two holes, one plugged

    The second hole in the bottom of a skimmer can be linked to your main drain or a secondary water intake. These are for low water level conditions to keep your pump from running dry if your pool gets low. If it had been used, there would be a ball/float contraption that would close off the skimmer and force the pump to pull water from the lower source. If it is not currently rigged up, then it is just plugged off so it doesn't leak or collect trash. If they look bad you could try to pull them and replace them, just be careful not to break your skimmer housing in the process. My plugs are actually glued in with PVC glue because I did not use them either.

    Regarding one skimmer pulling harder than the other, my skimmers do that too. The one closer to the pump has more pull than the far one. That's just a function of your plumbing configuration. I have valves that I can use to adjust, but I just let them pull as hard as they want.

    There is usually also a third knock-out hole in the back of the skimmer that can be used as an overflow.

    Hope this helps
    Fortune favors the well prepared

    The build...
    Freeform 24' x 38' IG gunite. 3 1/2' to 8' deep. 28,500 gallons. AutoPilot Total Control SWCG. Pentair Intelliflo VF. Pentair CCP520 cartridge filter. Colorlogic LED lights. Tahoe Blue Diamond Brite. 1200 sq ft stamped concrete deck.
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