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Thread: Low Filter Pressure Only 5PSI - Nomally 20PSI

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    Low Filter Pressure Only 5PSI - Nomally 20PSI

    When I was checking my filter this evening. My filter pressure meter was only reading 5psi, Nomally 20psi. I have two skimmer inlet feeding my hayward filter and two returns. I notice when I close off one of my return lines the pressure climbs to 18-20 psi. Does this indicate a clogged line or a break in the line.

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    JasonLion's Avatar
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    Re: Low Filter Pressure Only 5PSI - Nomally 20PSI

    Low filter pressure could be caused by a clog in one or both of the suction lines, or by air in the pump strainer basket. It could also be caused by a broken pressure gauge.

    How is the water pressure coming out of the returns?
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    dmanb2b's Avatar
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    Re: Low Filter Pressure Only 5PSI - Nomally 20PSI

    Sounds like the line that you are closing off to get pressure back to normal is sucking air from somewhere. Is that line running from the skimmer door? Sometimes toys etc can jam the door or restrict water flow.
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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    Re: Low Filter Pressure Only 5PSI - Nomally 20PSI

    Return pressure is mild at best with both returns open - only 5 psi. With return #2 closed off the pressure is strong on #1 (18-20 psi). With return #1 closed Pressure is weak on #2 return (5 psi).

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    Re: Low Filter Pressure Only 5PSI - Nomally 20PSI

    All skimmers are clear. Filter bags are cleaned every year.

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    JasonLion's Avatar
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    Re: Low Filter Pressure Only 5PSI - Nomally 20PSI

    I was asking about the force of the water flow coming out of the returns, not the reading on the gauge.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Low Filter Pressure Only 5PSI - Nomally 20PSI

    the return water force is mild at best with both returns open. With return #2 closed off the water force is strong on #1. With return #1 closed water force is weak on #2 return.

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    JasonLion's Avatar
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    Re: Low Filter Pressure Only 5PSI - Nomally 20PSI

    That does suggest a blockage somewhere. Is the filter pressure the same when you draw from skimmer #1 only as when you draw from skimmer #2 only? If the pressure is the same either way, try opening up the pump, removing the strainer basket, and checking for debris underneath. If the pressure is different on the two skimmers, then the skimmer with lower pressure has some kind of blockage.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Low Filter Pressure Only 5PSI - Nomally 20PSI

    Yes, the pressure is the same when I close either skimmer valve. And, yes I have cleaned the pump basket. The blockage would appear to be in return line #2. What type of blockage could possible be in the return line - everything thing should have been filtered?

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    Re: Low Filter Pressure Only 5PSI - Nomally 20PSI

    not to contradict, but wouldn't a blockage in a return line increase the pressure? Seems like if there is no suction leak, losing pump prime, then the water has found a new place to go or the pump isn't pumping as much...
    24ft x 52in AGP 18000 gal
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    Re: Low Filter Pressure Only 5PSI - Nomally 20PSI

    Yes, That does sound logical. I have turned off the "automatic pool water level filler" - I'll monitor the water level to see if I am losing water.

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    Re: Low Filter Pressure Only 5PSI - Nomally 20PSI

    I have monitored the water level all day and there appears to be no plumbing (return line) breakage.

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    dmanb2b's Avatar
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    Re: Low Filter Pressure Only 5PSI - Nomally 20PSI

    You can try shuting off line #1 and leaving #2 open, then use a drain king w garden hose at the pump connection to reverse flow on #2 and see if it returns water through the skimmer with good flow.
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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