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Thread: Low Pressure?

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    Low Pressure?

    Hey folks,

    My sand filter has been consistently at 12 psi all season. All of the sudden last week it dropped to 8 psi. I cleaned out the skimmer basket and pump basket and sprayed them with a hose. They're 100% clean, but it's still at 8 psi. I don't think anything could be lodged in the pipes because the baskets were in there the whole time and would have caught anything. There is no bubble in the pump basket, and the water pressure coming out of the returns seems good.

    Those are all the things I know to test for. Any ideas what could be causing it or how to fix it? Could a backwash and rinse possibly solve a low pressure issue?

    Thanks
    18 X 36 In-Ground Vinyl Pool, Hayward 1 HP SuperPump, Hayward SP270T 350lb Sand Filter, CompuPool CPSC48 Salt Chlorine Generator, Hayward H400FDN 400 BTU Natural Gas Heater, 2 returns, 1 skimmer, No Main Drain

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    ship of fools's Avatar
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    Re: Low Pressure?

    If everything else seems normal it could just be a bad gauge. The cheapies don't last that long ..i end up replacing mine every year it seems.
    21,000 gallon inground
    Haywood Sand Filter
    Vinyl Liner

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    duraleigh's Avatar
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    Re: Low Pressure?

    Assuming the gauge checks out OK, sudden low pressure indicates some type of restriction on the suction side.

    If you are sure the pipes and skimmers are clear, then turn off the pump, remove the pump strainer basket and see if you can feel anything wrapped around the impeller.....that's a common issue.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Low Pressure?

    Will check on the gauge and the impeller.

    Regarding "If you are sure the pipes and skimmers are clear"...what's the best way to tell (or not best, but most practical)? I'm just assuming I don't have an obstruction because the skimmer basket and pump basket are always in, and they don't float up when the pump turns off. Is that a safe assumption for me to make?

    Thanks!
    18 X 36 In-Ground Vinyl Pool, Hayward 1 HP SuperPump, Hayward SP270T 350lb Sand Filter, CompuPool CPSC48 Salt Chlorine Generator, Hayward H400FDN 400 BTU Natural Gas Heater, 2 returns, 1 skimmer, No Main Drain

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    Re: Low Pressure?

    Is that a safe assumption for me to make?
    Not really.get a snake in there if the impeller is clear. You may have ingested a pool toy or something.

    There are NO bubbles in your pump strainer basket when the pump is on....correct?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Low Pressure?

    Yeah, no bubbles in the pump strainer basket. A snake is a good idea. Suppose I could try a garden hose too. It's PVC, so I've got some 90 degree elbows to contend with but shouldn't be too bad.

    I tried sticking my hands near the impeller yesterday but couldn't quite reach. Although, it was a half-hearted attempt since my brain was throwing off false warning signals that despite the power being cut, this thing is ready to turn on in a moment's notice

    Thanks for the help. Will check it out.
    18 X 36 In-Ground Vinyl Pool, Hayward 1 HP SuperPump, Hayward SP270T 350lb Sand Filter, CompuPool CPSC48 Salt Chlorine Generator, Hayward H400FDN 400 BTU Natural Gas Heater, 2 returns, 1 skimmer, No Main Drain

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