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Thread: DE Blowing in to Pool

  1. Back To Top    #1

    Join Date
    May 2008
    Virginia Beach, VA

    DE Blowing in to Pool

    Hayward 60 sf DE filter, Hayward 7 position multi-port valve, 1HP motor, vinyl liner.

    After opening this year and my first backwash, I clearly saw clouds of DE blowing in to the pool from the returns. I suspected my old multi-port valve probably had a bad gasket; I had replaced it a couple years ago and had a fit getting the old gasket out (almost like the factory had glued it in). After removing it, I did open it and sure enough the gasket was really messed up.

    So I bought a new multi-port valve (yes a new valve, not just gasket), vacuumed like crazy, backwashed and it seemed fine. A month went by and I noticed the filter pressure really wasn't rising; So I took the filter apart and soaked the grids over night. Looking carefully at the grids, they all seemed fine to me.

    Re-assembled and added DE, and every day now there is DE on the floor, mostly along the edges at the bottom.

    Is it possible there was just still DE in the pipes from before? Maybe my grids have a rip somewhere I couldn't see?

    Running the Polaris stirs it up well, but it returns the next day. Is there any concern to swimming in the water with that stuff mixed in? Is it possible I am putting too much DE in? I try to follow the recommendations and have been doing this for 6 years now.

    I hate to just go and buy new grids without being sure.

    Any advice or experience is much appreciated.
    28K IG Vinyl lined pool - 1 skimmer, 2 returns
    Hayward DE 60sqft filter; Polaris 280 vacuum with booster pump

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: DE Blowing in to Pool

    There are lots of possibilities. There could be a tear in the grids you didn't notice. The DE could be left over because you didn't rinse long enough after backwashing. There manifold assembly inside the filter might be cracked, or it might not be put together correctly. A o-ring inside the filter might have gotten out of position.

    There isn't really any simple way to narrow it down, you just have to look at everything.
    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

  3. Back To Top    #3
    techguy's Avatar
    Join Date
    Jul 2010
    Antelope, CA

    Re: DE Blowing in to Pool

    I had a friend who always said to start looking at the least expensive parts first as they are the most likely to fail.
    -- Guy --
    10K gallons in 21' Round 52 inch wall Aqualeader AG, Hayward Power Flow LX 1.5 HP pump motor, Hayward Perflex EC50AC DE filter w/Cellulose, Wide mouth skimmer, 2013 new Diver Dan (craigslist) to replace the faded old Hayward AquaBug. TF-100

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