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Thread: What causes low psi?

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    What causes low psi?

    I used to have 10 psi on my filter. Now it is down to 2 psi recently. Does anyone know what may causing it? There is no debris around the main drains on the bottom of the pool. Skimmer is clean, too. I have not cleaned the filter for one year, but the pressure has been very steady at 10 psi. The motor sounds fine to me. I am afraid that the pipes from pool to the filter is clogged. But how likely is it? Thanks for your help.
    20,000 gallons, cartridge filter, concrete IGP, Bay Area, Northern CA

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    mas985's Avatar
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    Re: What causes low psi?

    Most often it is a clog in the impelller which causes low suction. The second most common reason is a clog in the suction side plumbing.
    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: What causes low psi?

    Thanks for your quick response. If it is a clogged pump impeller, I don't think I can handle it based on what I saw on you tube. I need to get someone to fix it. If it is the suction side plumbing, is there anything I can do to verify and fix it?

    Will there be any damage to the pump or filter if I keep running it? Thanks.
    20,000 gallons, cartridge filter, concrete IGP, Bay Area, Northern CA

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    mas985's Avatar
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    May 2007
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    Pleasanton, CA
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    Re: What causes low psi?

    Sometimes you can reach the impeller clog through the pump basket. Remove the basket and try to reach into the hole at the bottom.

    As for a clog in the pipes, a drain king can be inserted into the pipe feeding the pump via the pump basket and sometimes that is enough to free the clog.
    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: What causes low psi?

    It actually works!!! Thanks very much.
    20,000 gallons, cartridge filter, concrete IGP, Bay Area, Northern CA

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