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Thread: Would freezing temps cause filter pressure to be high?

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    Would freezing temps cause filter pressure to be high?

    Here in SC we have had about 2 weeks of freezing temps. Most days it gets into the mid 30's to mid 40's. My pool filter usually reads about 17 psi normally when pump is on high. I have been running pump on high 24/7 to prevent any freezing in my lines, but I've just noticed 2 days ago (don't always look at the filter gauge every day), that the pressure is up close to 30. I've backwashed several times, and the pressure remains the same.

    Could it be that water is frozen in part of my filter, causing pressure to go up? My pool water temps have been in the upper 30's, so that doesn't seem likely, and like I said, my pump runs constantly, but I cannot think of any other reason my filter gauge would be reading so high.

    All my returns are open as normal, the pump and filter are 4 years old (sand filter), and I use BBB method. I replaced the filter gauge about a year ago, and I know they easily malfunction, but would it read higher than normal?
    Judy

    Designated "pool girl" for 18' x 40' in-ground vinyl pool built in 2006

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    Mod Squad JohnT's Avatar
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    Re: Would freezing temps cause filter pressure to be high?

    I've never had a pressure gauge survive being outside in freezing weather. Does yours drop to zero when the pump is off?
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Re: Would freezing temps cause filter pressure to be high?

    Yes, when off, it drops to zero, and when pump is on low, it drops to about 5 (usually reads 1-2psi on low).
    Judy

    Designated "pool girl" for 18' x 40' in-ground vinyl pool built in 2006

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    spishex's Avatar
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    Re: Would freezing temps cause filter pressure to be high?

    Are you getting normal water flow back into the pool from the returns?

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    Re: Would freezing temps cause filter pressure to be high?

    I'm not really sure. Don't want to stick my hands in the pool to feel the return! I guess I need to though, to determine if there is a problem with the pressure side of the system, or a problem with the gauge. I was just wondering if a filter could become "frozen" and that would explain the problem.
    Judy

    Designated "pool girl" for 18' x 40' in-ground vinyl pool built in 2006

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