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Thread: Low PSI on Pump

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    irishal's Avatar
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    Low PSI on Pump

    My tale continues with opening the pool this weekend and as usual I'm turning to my trusty, helpful sources here. Attached is a pic that show the current PSI on the pool pump. This reading seems low to me, compared to the previous 2 years. However, the force of the water coming out of the return seem to be just fine. Is it possible my guage is reading faulty?
    30ft round AG pool
    2 HP pump
    Sand filter
    [attachment=0:2xk02qwz]Pool PSI.jpg[/attachment:2xk02qwz]
    Attached Images Attached Images
    Alan
    30ft AGP
    2hp pump
    TFTestkits ,Pool Calculator, Pool School

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    frustratedpoolmom's Avatar
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    Re: Low PSI on Pump

    Yes, gauges do go bad. You can pick up a replacement.
    Does the gauge go to zero when the pump is off?
    Is this a 2 speed pump? My gauge reads about 3-4 on low but 15-16 on high speed.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    irishal's Avatar
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    Re: Low PSI on Pump

    It does go to zero when it is off. It is a single speed pump. Last season it routinely stayed in the 12-14 PSI range on the low side after backwashing.
    I've read that it's possible for the filter basket to be clogged before the pump itself or for there to be a blockage there?

    Cheers.
    IrishAl
    Alan
    30ft AGP
    2hp pump
    TFTestkits ,Pool Calculator, Pool School

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    Mod Squad Bama Rambler's Avatar
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    Re: Low PSI on Pump

    The gauge could actually be reading below zero but the stop prevents you from seeing it. Gauges don't usually fair well over the winter. I would change it out for peace of mind.
    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
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Low PSI on Pump

    Changing the guage is a cheap, sure-fire way of confirming your pressure is low or the original guage was bad.

    Assuming the pressure is truly low, you have a restriction somewhere between the main drain/skimmers and the pump impellor. That is called the "suction side" of your plumbing.

    The impellor could be clogged, a valve could be half closed, or something could be stuck in one of the pipes or it could be something else but it is in your suction side plumbing. I would suggest starting at one end or the other until you find the restriction.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    irishal's Avatar
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    Re: Low PSI on Pump

    So I have to add the happy conclusion to this tale. I got a replacement pressure guage, put it on and still identical to the old one (4-5PSI). Soooooo I plug up the pool, and start pulling apart the pump. I cleaned the impellar (which appeared just fine), the filter basket, the lines etc..etc. I put the pump back together and began to connect the hoses back up to the pump when I noticed.....I had the hoses connected to the filter backwards!!! Meaning i had orginally hooked up the hose that goes to the pool return to the pump valve. Yes I'm an idiot!!
    As soon as I fix them, and turned pump back on normal pressure was restored at 13PSI!!!

    Needless to say
    Alan
    30ft AGP
    2hp pump
    TFTestkits ,Pool Calculator, Pool School

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    Re: Low PSI on Pump

    Every issue with a pool turns into a learning experience. Having gone through that clearing procedure, you probably know a whole lot more about your system than you ever did before. I am really glad you found it.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    frustratedpoolmom's Avatar
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    Re: Low PSI on Pump

    We won't flame ya. We've all had our "special" moments.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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