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Thread: Help with low return water pressure

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    Help with low return water pressure

    I have a 21" sand filter, 3/4 hp motor that I got used last year. I have another post in this forum trying to identify it. Anyhoo, for the last few days the water pressure on the return line has seemed quite weak. I would think it was a clog, but I have checked everywhere except in the sand itself and have found nothing. The pressure also does not seem high enough for a clog, only about 7psi. The odd thing is, I have great pressure when backwashing or dumping to waste, which leads me to believe the problem is after the pump. Any help would be appreciated.
    24' Intex Above Ground Pool
    As yet unidentified 21" Sand filter, 3/4HP motor
    Intel SWCG for 15000 up to gallon pools
    In business since Summer 2012

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    Mod Squad jblizzle's Avatar
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    Re: Help with low return water pressure

    If you have a problem after the filter, then the pressure would read high and you would have low flow.

    What does the water look like? When did you last backwash? Any valves in the wrong position?
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: Help with low return water pressure

    The water is pretty bad, just getting warm enough to get out and open up here, so I am still SLAMing. I backwashed just today, left it running longer than normal just to make sure everything was out.
    I am pretty positive that nothing is connected wrong or any valves are wrong as I have spent the last 2 days going through every line one by one looking for a clog.
    24' Intex Above Ground Pool
    As yet unidentified 21" Sand filter, 3/4HP motor
    Intel SWCG for 15000 up to gallon pools
    In business since Summer 2012

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    Mod Squad jblizzle's Avatar
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    Re: Help with low return water pressure

    Sounds like it could just be a dirty filter.
    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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    Re: Help with low return water pressure

    Does that mean replacing the sand, backwashing longer, or actually opening the filter to see if there is any large debris?
    24' Intex Above Ground Pool
    As yet unidentified 21" Sand filter, 3/4HP motor
    Intel SWCG for 15000 up to gallon pools
    In business since Summer 2012

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    Mod Squad jblizzle's Avatar
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    Re: Help with low return water pressure

    Backwashing. Is the pressure lower after a backwash? May also want to deep clean the sand as described in a sticky in the pumping station forum.
    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!

  7. Back To Top    #7

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    Re: Help with low return water pressure

    The water pressure from the return is about the same after backwashing, slight drop in psi on gauge after, maybe 1psi. I will try backwashing again and if that does not work I will do the deep clean in the sticky. Thank you so much for your help!
    24' Intex Above Ground Pool
    As yet unidentified 21" Sand filter, 3/4HP motor
    Intel SWCG for 15000 up to gallon pools
    In business since Summer 2012

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    Mod Squad jblizzle's Avatar
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    Re: Help with low return water pressure

    Does the gauge go to zero with the pump off?
    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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    Re: Help with low return water pressure

    Yes it does. Gauge is new this year, so it is most likely accurate.
    24' Intex Above Ground Pool
    As yet unidentified 21" Sand filter, 3/4HP motor
    Intel SWCG for 15000 up to gallon pools
    In business since Summer 2012

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