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Thread: Adding DE to sand filter?

  1. Back To Top    #1

    Join Date
    Mar 2015

    Adding DE to sand filter?

    I read about how you can add some DE mixed with water into the skimmer to increase the sand filter's ability to catch small stuff. So I did that, it took a cup to increase the PSI by 1 lb.

    Do I need to add DE each time I backwash? IE does it get washed out when I backwash? Any other tips?


    18,000 Gallon in ground pool with SWG
    Plaster surface, Maytronics Z5 robot
    Multi speed pump, Hayward sand filter
    TF-100 test kit
    K-1766 salt test kit

  2. Back To Top    #2
    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: Adding DE to sand filter?

    Yes, it needs to be replenished. It forms a superfine layer on top of the sand. In relative terms, like putting window screen over chicken wire. Expect your pressure to rise fast and need a backwash.
    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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