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Thread: Pump empties skimmer before it can fill?

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    Pump empties skimmer before it can fill?

    Just curious if it is normal that the pump sucks the water out of the skimmer faster than the pool water can flow back in the skimmer when the water is anywhere below halfway between the max and min lines?

    Granted, I usually keep it at max, and putting the 3 way valve to take water from both the skimmer and the drain prevents this, was just curious...

    Also is that the correct position for the 3 way valve or should I be filtering from the skimmer only and not the drain port?

    20,000L (5,200 gal) round AG pool, Hayward sand filter, 1.5hp pump, in the Laurentians, Quebec Canada
    Pool gets medium amount of sun, due to the house and surrounding trees.

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    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: Pump empties skimmer before it can fill?


    I would say either raise the water level some to help the water get into the skimmer or reduce the suction from the skimmer. Nothing wrong with pulling some water from the bottom as it gives you better circulation.
    Jason, TFP Moderator
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    Join Date
    Mar 2011
    Houston, Texas

    Re: Pump empties skimmer before it can fill?

    Check and make sure the skimmer flap (called a weir (sp?). Mine was getting stuck for just a split second on some gunite that wasn't cleaned off of the inside of the skimmer and that was enough for the skimmer to empty and for the pump to lose prime.
    9,200 gal. Gunite Luna Quartz French Grey pool with spill over spa, two fountains on tanning ledge (rarely used)
    Pentair Whisperflo 2HP, Pentair CCP Cartridge 420 Sq. Ft., Polaris 280 with booster pump
    Pentair EasyTouch 4, RayPak LoNox 266k Natural Gas heater, Aqua Rite SWCG T Cell 9, Borates, TF-100 test kit

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    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Pump empties skimmer before it can fill?

    Both of the above posts have good advice but to answer your question, No it's not normal. Anytime you suck the skimmer empty you're allowing air into the system and that's not a good thing. Make sure you have a weir and that it's working correctly and it's fine, even preferable, to pull from the skimmer and main drain.

    Give us a list of your equipment so we'll know what we're dealing with. It sounds like your pump may be oversized for the suction devices you have.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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