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Thread: pressure drop

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    pressure drop

    Cleaned the filter about 2 weeks ago and the pressure reading was perfect 9. Right where it usually is.

    The past 2 days it has dropped to about 6 even as I increased the flow rate from 1800 rpm to 1900.

    Should I worry?
    18,900 Stonescapes Tahoe Blue xtra black, 8 jet Spa, Pentair inteliflo VS , Pentair FNS 60 DE, Inteliclor40, Pentair 400,000 Mastertemp heater, 3 spillovers powered by a Pentair 1 HP whisperflo pump, The pool Cleaner, 2 Intellibright color changing lights and 400 sq ft. of Heliocol roof mounted solar.

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    JasonLion's Avatar
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    Re: pressure drop

    That usually indicates some kind of minimal blockage on the suction side, perhaps leaves or debris either in the skimmer or in the pump strainer basket, normally very easy to fix.
    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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    Re: pressure drop

    No leaves in either basket. Re-lubed the seal on the pump. The water flow on the eyelets is strong & the suction side pool sweep is moving well.
    18,900 Stonescapes Tahoe Blue xtra black, 8 jet Spa, Pentair inteliflo VS , Pentair FNS 60 DE, Inteliclor40, Pentair 400,000 Mastertemp heater, 3 spillovers powered by a Pentair 1 HP whisperflo pump, The pool Cleaner, 2 Intellibright color changing lights and 400 sq ft. of Heliocol roof mounted solar.

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    Re: pressure drop

    It's more then likely a clogged impeller..

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    Re: pressure drop

    whats an impeller. Is it part of the pump?
    18,900 Stonescapes Tahoe Blue xtra black, 8 jet Spa, Pentair inteliflo VS , Pentair FNS 60 DE, Inteliclor40, Pentair 400,000 Mastertemp heater, 3 spillovers powered by a Pentair 1 HP whisperflo pump, The pool Cleaner, 2 Intellibright color changing lights and 400 sq ft. of Heliocol roof mounted solar.

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    mas985's Avatar
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    Re: pressure drop

    The impeller is in the wet end (water part) of the pump and is what actually pumps the water. With the pump turned off, if you remove the pump basket and reach in at the bottom you will feel an inlet to the impeller. Sometimes you can reach in and pull out any blockage that may be there. However, sometimes you have to take apart the pump to remove the blockage but hopefully you won't have to do that.

    Have you recently been vacuuming the pool with a lot of debris?
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Re: pressure drop

    Nope- no deep cleaning- I did reach in and there didnt seem to be anything in the impeller.
    18,900 Stonescapes Tahoe Blue xtra black, 8 jet Spa, Pentair inteliflo VS , Pentair FNS 60 DE, Inteliclor40, Pentair 400,000 Mastertemp heater, 3 spillovers powered by a Pentair 1 HP whisperflo pump, The pool Cleaner, 2 Intellibright color changing lights and 400 sq ft. of Heliocol roof mounted solar.

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    duraleigh's Avatar
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    Re: pressure drop

    If all else appears to be operating correctly, you could change out the pressure gauge. They fail frequently but, honestly, a drop from 9 to 6 is not the way they typically fail.

    I would still suspect you have a restriction somewhere on the suction side. I wouldn't "worry" much, but I would continue to investigate 'til I discovered the cause.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Mod Squad Bama Rambler's Avatar
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    Re: pressure drop

    Have you taken the filter apart and inspected it? If an oring or gasket has slipped out of place or a hole has developed in the grids the pressure would drop. Since you say you disassembled it a couple weeks ago something might have slipped.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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