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Thread: GPM and FILTER size

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    GPM and FILTER size

    I am trying to figure out my GPM for my older inground spa. I cant seem to find a specific formula for spas only pools with a min. Of 10,000 gallons. What turnover time do i divide my gallons by? I have a 690 gallon inground spa, 4 jets,1hp whisperflo, 1 skimmer, 1 drain, 1.5" piping, 3 90 deg. elbows and 4 on tbe return side. The heater is a 150k btu minimax and the skimmer is 22' away from pump. I am trying to get my gpm to be able to select approiate filter (cartridge).
    17k (430 Sq Ft) Salt Water In Ground Pool, 3.5'-7' depth, MDX2 Infloor system, Grotto/Tile Slide/Rock Waterfall Features, Wet-Edge Chilean Beach Tahoe Pebble surface, Intellichlor IC40, Easytouch Control w/remote, Pentair Clean & Clear Plus Cartridge Filter, Intelliflo VS-3050 Variable Speed Pump, 2 x intellibrite LED Color Lights

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    Join Date
    May 2007
    South Central NJ

    Re: GPM and FILTER size

    Rough guess, 65 GPM, give or take 10. The 1.5" plumbing is the biggest head loss generator.

    Owner of - PoolGuyNJ LLC
    Expert Pool and Spa Repairs, Renovations, and Augmentation. Helping people decide what is the right gear for meeting their needs. Expectations Set, Expectations Met, No Surprises.

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    stev32k's Avatar
    Join Date
    Mar 2009
    Mobile, Alabama

    Re: GPM and FILTER size

    Here is a link to the pump curves for your pump. It's hard to tell where the flow is on the curve unless there is a pressure gauge on the pump discharge. Without the gauge all you can do is make a rough estimate.
    20' x 40' IG with vinyl liner volume approx. 35,000 gal.1.5 H.P. main pump, Polaris 280 cleaner W/ 3/4 H.P. booster pump
    Hayward sand filter, 3.14 sq ft, 62 gpm. Stenner 45 MPH10 chlorine feed pump. 1 micron final filter bags (home made and very effective)

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