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Thread: Is 1/2 hp pump big enough

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    Is 1/2 hp pump big enough

    I have a 15x42 intex pool, the one with the aluminun frame. I was given a Hayward st166t Filter. What size pump do I need? It has 5500 Gallons I think.
    Is 1/2 hp big enough? Is this filter overkill. Should I sell it and get something else?


    Vinyl 18x36 Single Roman End
    ~26,000 Gallons
    Goldline SWG T-15 Cell
    Sand Filtration
    Pool Tool Zinc Anode
    LaMotte Color-Q Pro 11 Test Kit

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Is 1/2 hp pump big enough

    Listing only the HP of the pump doesn't really specify what size pump it is. The definition of HP has been "adjusted" by marketing types so that it really doesn't tell you much any more. Some 1/2 HP pumps would be fine on that pool, others would be just a little to small.

    Your best bet is to get a slightly larger, 3/4 HP or 1 HP, two speed pump. It will cost a little more up front, but the savings on electricity from running on low speed will more than make up for it. That way you have low speed to be energy efficient and high speed in case some situation comes up where you need a little more power (like vacuuming).
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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