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Thread: Calibrating pump speeds after upgrade to variable speed pump

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    Join Date
    Jun 2013
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    Austin, TX
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    Calibrating pump speeds after upgrade to variable speed pump

    My 2.4 total HP single speed pump is dying and I'm replacing it with a Pentair IntelliFlo VS. The single speed runs at 3450 RPM.

    Short of flowmeters before and after is there a way for me to get an idea of what RPM on the Pentair gets as much circulation as my old pump?
    * My pump directly proceeds my sand filter, so is PSI there an indicator of flow rate?
    * The Pentair is listed at 3.95 total HP, so can I expect that 3450 RPM * 2.4 / 3.95 on the Pentair is equivalent flow?

    I hope to run most of the time at much lower RPMs, but like how the skimmers, spa, etc. work now and would like to replicate that.

    Thanks,
    Rob
    15k gallon, IG plaster pebble surface, single speed filter pump, sand filter, Polaris 280 cleaner w/ PB40 booster, AutoPilot Nano+ w/ RC-28 cell.

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    rolo918's Avatar
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    Re: Calibrating pump speeds after upgrade to variable speed pump


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    Mod Squad pooldv's Avatar
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    Aug 2012
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    Re: Calibrating pump speeds after upgrade to variable speed pump

    You just need to do a little experimenting. Here is where I ended up with mine.

    1100rpm for skimming and making chlorine, draws 150 watts and gives good skimming action. I started at 900 and ended up at 1100.
    1950 RPM for running solar panels, draws 550 watts and gives good flow through the panels and isn't too warm in the returns indicating pretty good solar efficiency.
    2500 rpm for solar and waterfall
    1500 skimming, filter, waterfall and no solar

    I would guess that about 2000 rpm will be close to where you were.
    TFP Moderator
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Join Date
    Jun 2013
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    Austin, TX
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    Re: Calibrating pump speeds after upgrade to variable speed pump

    Thanks. That fits with what I was guessing.

    @rolo918, that flow meter looks great, but pricey. Maybe I should have received one for Father's Day
    15k gallon, IG plaster pebble surface, single speed filter pump, sand filter, Polaris 280 cleaner w/ PB40 booster, AutoPilot Nano+ w/ RC-28 cell.

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