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Thread: Filter pressure not decreasing after backwash

  1. Back To Top    #1

    Join Date
    Dec 2013
    Location
    Augusta, GA
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    Filter pressure not decreasing after backwash

    I have noticed over the past month that my filter pressure does not decrease after backwashing. The gauge does go to zero when the pump is off, so I think the gauge is OK. It also does decrease slightly when I set the multiport to recirculate.

    During the time I have been watching this, the gauge is almost always right around 20 PSI. My previous clean pressure used to be closer to the 12-15 range.

    Some additional background:
    I have had a leaky pump seal for a while. It was an older pump so rather than replace the seal, my home warranty company agreed to replace the entire pump with a new Hayward Super model. This happened yesterday.

    Any recommendations of things to check regarding the gauge issue?

    thanks.
    IG gunite pool / 30,000 gal / 20'x 40'/ built mid 70's
    1.0 HP Hayward Super pump / Polaris PB4-60 booster pump
    Pentair SD-80 sand filter
    Intermatic mechanical timer (PF12222TB)
    Location: Augusta, GA, TF100 test kit

  2. Back To Top    #2
    Mod Squad jblizzle's Avatar
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    May 2010
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    Tucson, AZ
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    Re: Filter pressure not decreasing after backwash

    Sounds like the new pump is moving more water than the old one and thus the pressure is higher. Does the return flow seem higher?

    I would just assume that your new clean pressure is 20psi and backwash when it hits 24-25psi.

    Would have been nice to upgrade to a 2-speed motor though and save some money on electricity ....

    You could also Deep Clean your Sand Filter, but I am not sure that would be causing what you are seeing.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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  3. Back To Top    #3

    Join Date
    Dec 2013
    Location
    Augusta, GA
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    89

    Re: Filter pressure not decreasing after backwash

    Well, the thing is, the new pump was just installed yesterday. I have been seeing the higher filter pressure for at least a month, and it remains the same with the new pump. I have tried backwashing for longer periods, but doesn't seem to make a difference.

    And yes, it would have been nice to upgrade to a 2 speed motor. However, it was sweet to get a brand new Hayward pump installed for only $75.
    Last edited by techman65; 06-20-2014 at 10:39 AM. Reason: typo
    IG gunite pool / 30,000 gal / 20'x 40'/ built mid 70's
    1.0 HP Hayward Super pump / Polaris PB4-60 booster pump
    Pentair SD-80 sand filter
    Intermatic mechanical timer (PF12222TB)
    Location: Augusta, GA, TF100 test kit

  4. Back To Top    #4
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: Filter pressure not decreasing after backwash

    So clean the sand and see what happens. Check for any return valves partially closed. Hopefully there is not a return clog somehow.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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