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Thread: what size pump

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    what size pump

    i debated for a year if i was gonna keep this pool or not..come to find the pump i had is shot and will be buying a new one this week so i can get her up and running again..the pool is ag 18x33 with a 200lb sand filter skimmer and drain in the far end and is around 18k gal. of water..the filter is a aquatools...i found a good price on a 1.5 hp is this too big..its hotter then heck in michigan i cant wait to get her up and running again
    18x33 above ground w/center drain
    15,000 gal.
    at3120 sand filter 1hp jacuzzi (2.18 surface area 44gpm filter rate)

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    Mod Squad JohnT's Avatar
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    Apr 2007
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    SW Indiana
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    9,089

    Re: what size pump

    I imagine a 1.5HP pump is way too big for your 200lb filter. Typically a 300lb sand filter is about right for a 1HP pump. You can probably get by with a 3/4HP pump unless you need extra flow for an automatic cleaner.
    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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    poolgirl22's Avatar
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    Apr 2010
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    Stephens City, VA
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    595

    Re: what size pump

    Mines 1hp for an 18x38x3.75ft deep...16100 gallons, 200lb sand filter one skimmer, one return, one main drain.
    Backyard pool-less, but used to be.....
    16,100 gallon, 18x38 3.5 ft deep oval AG, Vinyl, Sand, 1hp pump
    http://www.poolservicestech.com Liquidator
    http://www.poolcalculator.com/
    http://www.tftestkits.net TFT100 test kit

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    Re: what size pump

    thanx for the quick replies..the 1 hp is even cheaper
    18x33 above ground w/center drain
    15,000 gal.
    at3120 sand filter 1hp jacuzzi (2.18 surface area 44gpm filter rate)

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    Join Date
    Aug 2007
    Location
    Jackson, NJ
    Posts
    61

    Re: what size pump

    If your signature specs are accurate, your old pump moved 44 gpm. I assume this was at a nominal "clean" filter operating pressure of somewhere between 10-15 psi gauge reading (note: 1 psi = .43 feet of head). This means that you would pump about 2640 gph, turning your pool over once in about 7 hours. My advice is to buy a new pump to match that performance and run it about 10 hours per day, turning your pool over 1.5 times (which is more than the minimum recommended in Pool School, but I like the results I get by filtering more than the minimum.)

    It is not only horsepower that dictates flow, but pump design. Some pumps are more efficient than others, so check the flow characteristics, not just the hp before you buy. I would go to http://www.haywardnet.com/aboveground/products/pumps/ as a reference. I think you can probably get away with 3/4 hp, but if in doubt I would go to the next size upwards (1hp).
    phil_d
    20,000 gal. vinyl liner pool
    Hayward Perflex EC-65 DE filter w/1.5 hp Hayward Super Pump
    Liquidator w/ 3/8" upgrade
    Aquabot Jr. pool cleaner

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