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Thread: Above ground pump size

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    Above ground pump size

    For those of us who have the "seasonal" above ground pools, I'd like to know a little more on proper sizing of pumps for these types of pools. I have one of those metal frame pools (15' x 42") that came with "everything". But, I don't think that the pump is sufficient for the pool size. Just when I think I have things going well, the water starts to get cloudy, then green and I have to start all over again! I leave the pump running every night for 5 hours, but I just can't keep up with it. I can't figure out what I'm doing wrong? You're the expert - do you make house calls? Signed - New guy

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    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    SW Indiana
    For the pump that comes with those, 24/7 operation is the only way it has a chance to keep up. That said, green has little to do with the filter. It's a result of low chlorine levels.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD
    Welcome to TFP!

    You want a pump that will move the same number of gallons as are in the pool in somewhere around eight to twelve hours. Many above ground pool kits come with such a pump, or sometimes a larger one, but pair it with a drastically undersized filter. If you tell us which specific pump and filter you have we can give you some more specific advice.

    Getting algae is a problem either with low chlorine or high stabilizer. Many chlorine products, notably trichlor and dichlor, contain stabilizer, which reduces the effectiveness of chlorine when the stabilizer level gets too high.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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