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Thread: Reduced pressure and reduced flow

  1. Back To Top    #1
    deanchat's Avatar
    Join Date
    Feb 2008
    Location
    Tidewater, VA
    Posts
    28

    Reduced pressure and reduced flow

    Hi Everyone,

    I backwashed last week and post-backwash filter pressure was 14.5 (which is right on target based on 10 years of experience with this pool, my filter runs at 14.5 psi with a new, post-backwash DE charge). Pool ran at 14.5 for a day or two, then it started dropping. Went to 12.5, then a couple more days later to 11 then to 10 and now it is at 6.5 psi.

    Water is clear (as it was before the backwash). Skimmer and pump basket are clean. Water flow has definitely decreased, but still enough (for now) to pop up the bottom returns and to keep the AutoPilot running. Any ideas what could cause the pressure/flow drop after a backwash?

    Thanks,
    Dean
    37x16 IG vinyl, about 20K gals
    Pentair FNS 60 DE filter
    3/4 hp Pentair Challenger pump
    1 skimmer, 2 bottom returns + 1 step jet
    AutoPilot Dig 220

  2. Back To Top    #2

    Join Date
    Jul 2011
    Location
    St. Paul, MN
    Posts
    244

    Re: Reduced pressure and reduced flow

    I would check to see if there is anything in the pump. Turn the pump off and reach in through the pump basket to see if any leaves or other debris in there.
    20'x40' Oval 27,000 gallon Vinyl IG, Coverstar Auto Cover
    Hayward MaxFlo SP2303VSP, Sta-Rite PLD50 30 sq. ft. DE filter
    Rheem 266,000 btu natural gas heater
    Dolphin Nautilus Plus with Clever Clean
    TF-100 testkit w/ Speed Stir

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