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Thread: Can I downsize pump motor, keeping the same housing/strainer

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    Join Date
    Jun 2011
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    Florida
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    Can I downsize pump motor, keeping the same housing/strainer

    My pump motor is oversized for my pool. I currently have a 1.5hp, I would like to go down to the 0.75hp. My question is, can I replace the pump motor while keeping my existing housing/strainer? I read somewhere that I will have to change out the impeller to match the smaller pump size.

    I would rather not disconnect the piping, but if it makes the most sense to buy a complete new pump I will do that. Any thoughts?
    9.5k IG Pool
    Plaster (Diamond Brite)
    Sand Filter

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    Mod Squad Bama Rambler's Avatar
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    Jun 2009
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    SouthWest Alabama
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    Re: Can I downsize pump motor, keeping the same housing/stra

    You can change it as long as you change the impeller to match the new motor SFHP. While you're changing it you could go with a 2-speed model and that'll save you even more. If ou wanted to keep the impeller you could stick with a 1½hp model and still save a lot.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    May 2009
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    Youngsville NC
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    Re: Can I downsize pump motor, keeping the same housing/stra

    You could put the smaller motor and impeller in, but by the time you add in the seal kit / etc - you'll probably find it more cost effective to just replace the pump (maybe put the old one up on Craigslist ? )

    You can find some above ground pumps that are self priming of your desired HP for around $200 -$250 that would work well for your situation. The Pentair Dynamo or the Hayward Powerflo II should both work just fine for your use - I was using a 28 year old powerflo II (without strainer) on my inground pool that is twice the gallons of yours with no problems until I got my replacement Superflo.
    16x32 IG 19,000 gallons, Pentair 1.5 hp Energy Efficient Superflo pump (348024),vinyl liner, Chlorine dispenser, Hayward S-244T sand filter

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