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Thread: Sand Filter issue

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    Sand Filter issue

    When I move from filter to the backwash I lose pressure in the filter trap. Why would this be happening?
    40,000 gallons (20' x 40'); IG; vinyl liner
    sand filter
    BBB method for 2 full seasons
    tf100 test kit
    central Illinois

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    JasonLion's Avatar
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    Re: Sand Filter issue

    "filter trap"? I'm not sure what you are referring to.
    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

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    Mod Squad woodyp's Avatar
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    Re: Sand Filter issue

    Do you mean in the pump strainer basket in front of the pump?
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
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    Adamsaudio's Avatar
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    Re: Sand Filter issue

    On my sand filter, when I set it on backwash or waste, it creates a suction through the pump and skimmer even if the pump isn't on. I believe this is normal operation. If the valve isn't diverting properly, you may have an issue with the spider gasket. More details on the problem would Def help diagnose it better.

    24 ft Round Above Ground - 13500 gallons... Former Pool Frog user. Sand filter . Located just South of Atlanta

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    Re: Sand Filter issue

    Yes in the strainer basket. Does it matter that I'm not using the chlorinator and water is still moving through it? Or is this likely a sign of faulty equipment like something needs replaced?

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    JasonLion's Avatar
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    Re: Sand Filter issue

    The chlorinator shouldn't make any difference.

    I also suspect it might be the spider gasket, as Adamsudio suggested.
    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

  7. Back To Top    #7

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    Re: Sand Filter issue

    I've also noticed a drop in pressure consistently showing 10 psi less than normal. Where is the spider gasket located?
    40,000 gallons (20' x 40'); IG; vinyl liner
    sand filter
    BBB method for 2 full seasons
    tf100 test kit
    central Illinois

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    Adamsaudio's Avatar
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    Atl
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    Re: Sand Filter issue

    Can you post a pic of your multi port valve?

    24 ft Round Above Ground - 13500 gallons... Former Pool Frog user. Sand filter . Located just South of Atlanta

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    Re: Sand Filter issue

    Not sure what that is?
    40,000 gallons (20' x 40'); IG; vinyl liner
    sand filter
    BBB method for 2 full seasons
    tf100 test kit
    central Illinois

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    Adamsaudio's Avatar
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    Re: Sand Filter issue

    The valve you move to take the filter to backwash. The spider gasket is under the cover of the valve that diverts the water.

    24 ft Round Above Ground - 13500 gallons... Former Pool Frog user. Sand filter . Located just South of Atlanta

  11. Back To Top    #11
    Richard320's Avatar
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    Re: Sand Filter issue

    Quote Originally Posted by birkesl View Post
    Not sure what that is?
    It'll look similar to this:
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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