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Thread: Psi pool issue

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    Psi pool issue

    Hi guys. I have a question. I have a pentair nsf48 de filter. I have a 25,000 gallon pool. Why is it everytime I shock my pool my psi goes up. After a cleaning/backwash, my psi is at 20, after I shock it, within 30 minutes, it's at 30 and I have to backwash it. Please help. Thank you

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    Mr Bruce's Avatar
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    Re: Psi pool issue

    What do you mean by "shock it"?
    32K gallon Plaster - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart

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    Re: Psi pool issue

    I think I understand what you are saying. You backwash the filter and the psi goes down opn start up. However, after the filter runs for a half hour or so, the psi is back up, is that right?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Psi pool issue

    No. My psi is at 20 right now which for my pool is normal. Once a week, I'll shock it by adding 2 to 3 bags of shock, once I do that, within 30 minutes the psi on the filter jumps to 30

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    Re: Psi pool issue

    The most likely guess (and it's a guess without test results) Is you are killing some organics with the sudden addition of chlorine and the dead organics are then captured by the filter, causing the psi increase.

    We hope you';ll keep reading....TFP will show you a better way.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Psi pool issue

    So I take it no one really understands what's going on here?

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    Re: Psi pool issue

    I thought duraleigh's response pretty much covered it. Have you decided on a test kit yet? I would really stop adding "bags of shock" until you get a proper test kit and take control of your pool.
    32K gallon Plaster - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart

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    Re: Psi pool issue

    I have a test kit. Water checks okay in everything. I shock, by adding 2 to 3 bags of shock every week on Monday, if I don't, water gets cloudy by Wednesday, but as I said, it's annoying that everytime I do add the shock, my de filter psi jumps from 20psi to 30psi in less than 30 minutes

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    Re: Psi pool issue

    why do you shock every week? I shock twice a season....opening my pool, and just before closing.
    33' x 52" Swim and Play Inc. PARAGON AGP. Hayward H200 Heater. Hayward Power-Flo LX 1.5hp pump. Sta-Rite Cristal Flo T-210WF Sand Filter. Stenner 45M5 chlorine pump

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    Re: Psi pool issue

    If your water gets cloudy every 6 days or so you most likely have some algae in there. The shock is killing lots of it but not enough to permanently get rid of it so you are on a treadmill of sorts. Those of us on this forum that fallow the methods laid out in pool school either never shock if we keep the pool open all year or only at open and close for those in colder climates. The basic idea is that a properly maintained pool never needs a "shock". There can be mishaps where someone gets an algae bloom but we have a process called SLAM Shock Level and Maintain where the problem is dealt with over several days and then the pool is back to normal for weeks, months even years. Read through pool school especially the Defeating Algae link if it sounds like something you would like to try we can help you get to a place where you are not having to throw bags of stuff in the pool to keep the cloudiness at bay.
    12,300 Gallon, IG PebbleFina, 3 ft sheer, 2 Jandy nicheless LED lights, Jandy Pro 1.5HP VS pump (A.O. Smith Motor), PB4-60 Booster pump, Polaris 280, Jandy cv340 cartridge filter, Zodiac Z4 control panel W/iAquaLink, Stenner pumps for chlorine & MA connected to WiOn WiFi switches, TF-100. You can support TFP with AmazonSmile just click the link!

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    Re: Psi pool issue

    Thank you for your help, I was always told to throw 3 bags of shock every week into the pool no matter what. I'll try things differently this year, thanks guys.

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    Re: Psi pool issue

    You need to read thru the Pool School
    15,000 gallon inground fiberglass pool with spa. 350lb Sand filter, 1.5 hp pump, and heater

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    Re: Psi pool issue

    Yup Pool School is the place to start, read through the ABCs get one of the recommended test kits and come back with any questions and some test results. With a little work not only will you end up with a cleaner pool but you will spend a lot less money on mistrie chemicals.
    12,300 Gallon, IG PebbleFina, 3 ft sheer, 2 Jandy nicheless LED lights, Jandy Pro 1.5HP VS pump (A.O. Smith Motor), PB4-60 Booster pump, Polaris 280, Jandy cv340 cartridge filter, Zodiac Z4 control panel W/iAquaLink, Stenner pumps for chlorine & MA connected to WiOn WiFi switches, TF-100. You can support TFP with AmazonSmile just click the link!

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