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Thread: High pump pressure 23lbs and low pressure at the return line

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    High pump pressure 23lbs and low pressure at the return line

    I have an in ground pool with Hayward sand filter, heater and chlorinator. Last monday I noticed that the pressure gauge was at 23 lbs, so I backwashed. Normally it would have dropped back to 14lbs, but it stayed at 23lbs and the pressure at the three returns was very low. Almost non-existent at the two by the stairs and a little more by the deep end. I switched the filter to recycle and the pressure stayed the same, so I did not feel it was a sand issue. Took the top off the chlorinator, turned on the pump and I had water spraying up about 7', so I believe the pressure is good that far. I was stumped at that point, so I had a local company come out (mistake). I was not here while they tested, but they say they tested the pressure going to the outlets and they did not see an issue. The switched out the sand, no change and now they are stumped as well. I would greatly appreciate any feedback you can offer.

    Thank you.

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    Mod Squad jblizzle's Avatar
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    Re: High pump pressure 23lbs and low pressure at the return

    does the gauge go to zero when the pump is off?

    Posted from my Droid with Tapatalk ... sorry if my response is short
    Jason, TFP Moderator
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    Re: High pump pressure 23lbs and low pressure at the return

    Quote Originally Posted by jblizzle
    does the gauge go to zero when the pump is off? Yes it zeros out when I turn off the pump. The company checked the gauge as well.

    Posted from my Droid with Tapatalk ... sorry if my response is short

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    Re: High pump pressure 23lbs and low pressure at the return

    Yes it zeros out when I turn off the pump. The company checked the gauge as well.

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    Re: High pump pressure 23lbs and low pressure at the return

    Thought I'd add that the the pool is 8-9 yrs old and we have all the original equipment. No issues until last week. Getting some bubbles out of the deep end return. Lots of pressure when backwashing.

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    In the Industry

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    Re: High pump pressure 23lbs and low pressure at the return

    Try running the filter in recirculate mode on the multiport valve. If the gauge reads lower on recirculate, your problem lies in the sand filter. If it reads the same, you may have a blockage somewhere.

    Edit: I just read you did try recirculate, I must have missed that part. Its possible you have a blockage in the plumbing or pump/impeller.

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    mas985's Avatar
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    Re: High pump pressure 23lbs and low pressure at the return

    The problem would likely be after the filter so do you have any check valves after the filter?
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
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