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Thread: Low pressure with 2 speed pump

  1. Back To Top    #1

    Join Date
    Apr 2014

    Low pressure with 2 speed pump

    I recently installed a new Hayward EC75 (40sqft) and a Pentair 1-1/2 HP 2-speed pump. With everything fresh and clean, I see about 10psi on the gauge when the pump is on high. When I switch it to low speed, the gauge goes to about 1psi, but the water is still flowing. Not nearly at the velocity of the high setting, but it's moving. Should I be concerned? Is the low setting usable at this pressure? I've left it on high through the initial spring cleanup, but now that the water is clear, I'm considering switching to low. Will it be effective at this pressure?

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Low pressure with 2 speed pump

    Yes. That is normal.

    You want to run on high when charging or backwashing the filter, manually vacuuming, and priming the pump. Otherwise you can run on low and save electricity.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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