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Thread: Low pump flow

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    Low pump flow

    I have a whisperflo 1 1/2 HP pump that used to pump like a charm. The outlet pressure is very low. The pressure gage reads 0 and I confirmed this by opening the valve on the top of the filter housing, and water just trickled out. I have cleaned all of the skimmers and the strainer, and checked the impeller for obstruction. I tried pulling from the drain and from the skimmers and no change. I think that the O-ring on the strainer basket is ok, but can't be sure. There are some small bubbles coming out of the jets, but not that many. The gage used to read somewhere around 5 psi but now is down to 0.

    I really think this is a pump performance or inlet restriction problem, but I don't know what to do next. I'm getting algae now so I need to do something. Please help.

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    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida
    If you are sure you have no restriction on the suction side, check to see if the impellor is tight on the shaft.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Thanks for the reply. I'm not sure that there is no restriction. Also, I checked the impeller and I'm pretty sure that it's not loose.

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    mas985's Avatar
    Join Date
    May 2007
    Pleasanton, CA
    With a suction restriction, the pump is usually very loud and there is air in the pump basket.

    Also, you can try and flush the suction line with a drain king or hose wrapped with a rag.
    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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