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Thread: Normal For Filter Pressure To Drop A Little?

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    Normal For Filter Pressure To Drop A Little?

    Hey folks,

    Background
    Opened the pool last week to a big mess. Now it's just milky cloudy water that I'm dealing with. This year I got a brand new oversized sand filter (27" 350 lb). I'm coming from a DE filter and still learning a little about the sand.

    Problem:
    While dealing with this milky/cloudy water I only expected to see my filter pressure rise (especially since I added a little DE to the filter). For the most part it's held fairly stead, except when I vacuumed. Last night however I noticed a 1 psi decrease in pressure. I only expected an increase, especially with my water, so this was surprising. Is this normal? All day yesterday and the day before it was 14 PSI, and now it's been 13 PSI all day today. Is a 1 PSI decrease normal? I did shock yesterday and I also had added 8lbs of baking soda.

    Sign of a filter problem or no big deal?

    Thanks
    18 X 36 In-Ground Vinyl Pool, Hayward 1 HP SuperPump, Hayward SP270T 350lb Sand Filter, CompuPool CPSC48 Salt Chlorine Generator, Hayward H400FDN 400 BTU Natural Gas Heater, 2 returns, 1 skimmer, No Main Drain

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    topher's Avatar
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    Jun 2012
    Location
    toronto, Ontario, Canada
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    136

    Re: Normal For Filter Pressure To Drop A Little?

    a big filter like that will take a bit for pressure to go up.. I dunno why it went down. wouldnt worry about it too much at this time.. it's new? and you put it together right? I have a small 19" ATM (will upgrade this winter) and my pressure goes up 2 lbs in a week.. it does go down when I vacuum but I dont pay attention to it that much. I just wait till hit 13-15 and then backwash.
    13500 gallon AG, build late 90's, Hayward S220T sand filter,1Hp aqua coastal
    Gasser BBQ broilmate 155154 LP, Smoker CGK (akorn)

    ,

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    JasonLion's Avatar
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    May 2007
    Location
    Silver Spring, MD
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    37,879

    Re: Normal For Filter Pressure To Drop A Little?

    Drops in filter pressure usually mean some kind of flow restriction or blockage on the suction side of the pump. Check the pump strainer basket and skimmer basket(s) and make sure they are free of debris.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  4. Back To Top    #4

    Re: Normal For Filter Pressure To Drop A Little?

    Skimmer Basket was all clear although pump basket had some stuff in it (not a ton but maybe).

    Only other thing I can think of is maybe some of the DE got gunked up in side the filter and it finally broke free. I premixed it, but it's the only other thing I can think of. Oh well...as long as it's not an obvious sign of something wrong with the filter I assume I'm all clear. Thanks!
    18 X 36 In-Ground Vinyl Pool, Hayward 1 HP SuperPump, Hayward SP270T 350lb Sand Filter, CompuPool CPSC48 Salt Chlorine Generator, Hayward H400FDN 400 BTU Natural Gas Heater, 2 returns, 1 skimmer, No Main Drain

  5. Back To Top    #5

    Re: Normal For Filter Pressure To Drop A Little?

    So, I had written off the skimmer basket when I didn't see a lot of stuff in it, but I figured what the **** and just went and cleaned it out and got rid of whatever gunk that was there. Restarted the system and turns out that was it. Pressure back up to 14. Thanks Jason!
    18 X 36 In-Ground Vinyl Pool, Hayward 1 HP SuperPump, Hayward SP270T 350lb Sand Filter, CompuPool CPSC48 Salt Chlorine Generator, Hayward H400FDN 400 BTU Natural Gas Heater, 2 returns, 1 skimmer, No Main Drain

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