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Thread: Cartridge filter sizing help

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    Cartridge filter sizing help

    Hi all. I have been lurking here for a while and really appreciate all the great information. I was hoping I could get some advice on filter sizing for my new IG pool. It is a 20x41 "mountain pond" at about 25,000 gallons. Since I will be using a SWG I decided to go with a cartridge filter. My builder does not have a lot of experience with these filters and I want to make sure I get the right size. I believe that he mostly use Hayward products. Can someone please recommend the right filter size for this pool?

    Thanks for your help in advance. I will certainly be posting pics of the new build


    22,000 gal IG vinyl pool
    AutoPilot Pool Pilot Digital SC-48
    Hayward 1 hp Super Pump 74 gpm
    Hayward C3030 Cartridge Filter 325 sq ft
    Rheem 6350ti Heat Pump 113k BTU
    TF-100 Test Kit

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    mas985's Avatar
    Join Date
    May 2007
    Pleasanton, CA

    Re: Cartridge filter sizing help

    I have a 420 sq-ft on a 20,000 gallon pool but in general, bigger is better and means more time between cleaning which is only 1-2 times per year for me.
    Hydraulics 101; Pump Ed 101; Pump and Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater, ThePoolCleaner

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    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Cartridge filter sizing help

    I agree with Mark, a 400+ ft² would be where to start.
    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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