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Thread: Hayward 4820 DE filter - First year, and Observatiosn?

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    Join Date
    May 2014
    Weston, CT

    Hayward 4820 DE filter - First year, and Observatiosn?

    Hey Guys,

    This was my first year using the 4820DE. What a huge difference compared to the old grossly undersized cartridge filter.
    That said, when I went to close the pool this last weekend, I tried a backflush and didn't notice much debris coming as viewed through the observation window port thingamajig.
    Truth be told, it was a while since my last backwash and recoating of the filter... Probably 1.5-2 months.

    After the pool was closed, I opened up the filter to see all grids were covered with sludge, and non was removed during the backwash.

    I pulled the grids and hosed everything off well, reassembled and all is fine.

    My question... Is this normal? Is this because I didn't backflush regularly and things gummed up? My pump is pretty powerful and I thought should clear old filter media from the grids.

    What should I do differently next year?


    25K In-Ground Vinyl, circa 1990. Hayward C800 with 1.5 HP Max-Flow Circa 1990???? In line Chlorinator. Raypak Heater.

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    In the Industry

    Hayward Pool's Avatar
    Join Date
    Oct 2014

    Re: Hayward 4820 DE filter - First year, and Observatiosn?

    Hi, Not sure what is going on here. Could be too much DE added at first. 48 sg ft model needs 6lbs or approximately 9 1lb coffee cans clean. Double check the plumbing of the waste line and valve.
    Hayward Pool Tech
    80+ Years of Technologically Advanced Pool Product Manufacturing

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