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Thread: What RPM do i need???

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    Join Date
    May 2014
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    San Diego, CA
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    35

    What RPM do i need???

    I have an older pool, that was put in sometime in the 70's... it has 1 skimmer and 1 bottom drain. There are 2 returns in the pool, but im not sure where it splits between the filter and the pool.
    We installed a new pump and filter last year (Pentair clean and clear 420, and intelliflo vs pump.) We are considering converting to saltwater, but i understand it requires 25 gpm of flow to operate correctly. I typically leave my pump on 24 hours a day at low RPM, but im not sure i would get the gpm required. Is there a best guess on what rpm to run my pump at to maintain 25 gpm, also, if the rpm is fairly high, will running the pump on low speed for most of the day then doing a higher speed interval to create chlorine damage the SWG?
    ~10,000 gallon IG painted plaster free-form pool w/ 1 skimmer and 1 main drain
    Intelliflo 3hp vs pump
    Pentair C/C 420 cartridge filter
    TF100 test kit

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    Divin Dave's Avatar
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    Oct 2013
    Location
    Longview, Texas
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    4,911

    Re: What RPM do i need???

    I have the same pump you have with a Pentair IC40 SWG. I run my pump at about 1100 RPM to get enough flow for the SWG to work.

    Your experience might be a little different depending on how much head loss you have in your plumbing. It probably wont be much though.
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
    www.tftestkits.net Experience- it's what's learned just after you needed it most !!

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    Mod Squad Jimrahbe's Avatar
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    Jul 2014
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    Bedford, TX
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    Re: What RPM do i need???

    My Intelliflo will also satisfy the flow switch in the IC40 at 1,100 RPM. I run mine at 1,200, just to make sure. At that RPM it only draws 168 watts.. I have a slightly larger filter, but I doubt that will make any difference at all.

    I believe that having a few inches of straight pipe before the SWG is important for keeping the flow switch happy at very low RPMs. You might want to keep that in mind when you install yours.

    Jim R.
    Finished in 2015 - 17K Gal, IG, 20' x 25' Almost Rectangular Pool, Pebble finish, three rockport water falls. Pentair Equipment: EasyTouch 4, IC40 SWG, 3 HP VS Pump, CCP520 Cartridge Filter.
    TF100 with SpeedStir and SampleSizer, ColorQ Pro 7, Dolphin Premier Robot Cleaner, added Screen Logic 2, added small 3 person Calder Spa.

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    GaryT58's Avatar
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    Jul 2016
    Location
    Monroe, GA
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    570

    Re: What RPM do i need???

    My pool is newer, 1 skimmer, 3 returns. My Autopilot Total Control (but would be same for any of their units) only requires about 15 GPM to operate. It will bypass any flow greater than 20 GPM away from cell. I am able to get down to about 600 RPM before the cell complaining about flow. So my lowest setting could be 650, but set to 800 just to make sure if sand filter starts to get dirty it won't restrict flow too much. I also like to run 24/7.
    38'x16' Fiberglass pool - 3.5' - 8' deep - 19,000 gallons. AutoPilot Total Control SWG (RC-52 cell), Pentair SuperFlo VS, Pentair SD70 Sand Filter, Coverstar Automatic Cover, 10' board, PAL Treo lighting, Polaris 9550 Sport robot, Lamotte ColorQ Pro 7 test kit.

  5. Back To Top    #5

    Join Date
    May 2014
    Location
    San Diego, CA
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    35

    Re: What RPM do i need???

    Thanks for all the replies, that was my biggest concern... i run mine at 950 rpm now unless im running my vac. So a couple hundred more wont hurt me to much.

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