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Thread: filter pressure drop

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    Diver's Avatar
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    May 2011
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    filter pressure drop

    i opened my pool friday night and the pump/filter were going since friday till this morning. the pressure with freshly coated filter was 9. over the course of 2 days it gradually built up to 11 psi (not much junk in the pool.)

    i scheduled the pump to run on the clock and today i noticed that the filter pressure was 9 psi. the jets are working fine, skimmer sucks fine. there are no bubbles in the pump basket, no air in the return.

    the only difference from this morning was that i buried some pipework i did a week ago. the pipework was all open and running fine for 2 days with no leaks. there are no apparent signs of any leak - the ground is dry, the water level stayed put. i think if the pressure drop was due to a leak i would see some air in the return and the water loss should be significant to drop 2 psi.

    only think i can think of is some settlement of the DE in the filter and i should simply keep an eye on the pressure to make sure it's going up. no sign of DE in the water. the water looks good.

    is there anything that can contribute to this sudden drop? anything i should worry about?

    thank you!!
    26K In-ground Vinyl Pool | Hayward DE4820/SP0710XR50 filter | 1.125 HP Dual Speed Hayward Super Pump | Aquasol Solar

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    duraleigh's Avatar
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    Re: filter pressure drop

    Few pressure guages are consistent enough to give you the same, precise reading each time. You may also have lessened the restriction in the filter simply by turning the pump on and off.....that lower restriction will let your psi drop a little.

    It may be simply a variation in your guage. You might turn it on and off and get a reading back to 11.

    As long as your flow volume seems to be OK, I would just leave it alone.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Diver's Avatar
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    Re: filter pressure drop

    Thanks Dave. So i guess i will simply keep an eye on things ...
    26K In-ground Vinyl Pool | Hayward DE4820/SP0710XR50 filter | 1.125 HP Dual Speed Hayward Super Pump | Aquasol Solar

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