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Thread: Help with filter size.......

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    Join Date
    Aug 2008
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    Eastern Washington State
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    Help with filter size.......

    G'Day All,
    I need help with sizing a sand filter. Money is an issue, so I would like to get the smallest filter (price) and yet provide adequate filtering for the pool. I have a good pump, but don't know the flow. The pool store says they need to know the flow before they can recommend a filter. It is a 1HP pump made by Hercules, w/ 1.5" in/out. It has no flow markings at all. I don't want to undersize the filter flow and burn out the pump. The only info on the pump is the motor info itself, which is a Century motor. Your assistance is appreciated.

    TJ.
    21' AG, 10,000 gal, 22" Sand Filter, 1 hp pump

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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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    8,617

    Re: Help with filter size.......

    The difference between an 18" and 24" sand filter is only about $50. I'd go with the 24" in a heartbeat.
    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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    launboy's Avatar
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    Jun 2008
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    S.E. Wisconsin
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    582

    Re: Help with filter size.......

    FWIW, my 1 HP pump delivers about 30 GPM, but that's with the sand filter(100#) and solar on, so it was lifting the water 12 feet up.

    I think any filter with a max. flow rate of 50 GPM or more will work. Generally, you can't have too big a filter. I would shoot for something in the 100 - 300 lb. range. Then again it seems that a lot of sand filters are now rated in Inches(which I have no clue about).

    HTH,
    Adam
    18' x 42" Intex Easyset Pool, with 16' x 52" deep end in the middle. Approx. 5500 Gal.
    Hayward Power-Flo LX 1 HP, 100# Jacuzzi Brand Sand Filter(Piped underground so it looks nice) 8)
    3 - 2' x 20' Solar Pool Heater Panels(roof mounted)
    Goin' on 9 summers...NOBODY thought it would last this long.
    Buried Portable Spa sharing pumps and water with pool (Almost complete project)

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    Join Date
    Aug 2008
    Location
    Eastern Washington State
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    11

    Re: Help with filter size.......

    Thanks, Adam & John.

    I see what you mean about the price, although many of the places I've found show much more than $50 between them --- some as much as $150. That is why I was concerned.

    It is confusing to me, though, how they (Hayward) can put a 1.5 hp motor on an 18" filter. Seems the flow would be restricted????

    Oh, Well.

    Thanks for the input. The PS, I think, just wanted to sell me a whole setup, not just the filter. Go figure!!

    TJ.
    21' AG, 10,000 gal, 22" Sand Filter, 1 hp pump

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    searayboater's Avatar
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    Jul 2008
    Location
    The Great State of Texas
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    65

    Re: Help with filter size.......

    The 1.5 hp would be too much pump for the sand filter size you are looking at purchasing. Not to mention the fact your electricity usage would increase with no real benefit in filtration. I used to have a 16" Hayward sand filter with a 1hp pump on a 18' ag and it was more than adequate. I've recently switched to a Hayward cartidge filter. I would go with the larger filter as well.
    18' AG Pool, 6900 gallons, 55 sq. ft. Hayward Easy Clear Cartridge Filter, 1hp Power Flow LX Pump, North Texas

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    Re: Help with filter size.......

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