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Thread: Add DE after backwashing

  1. Back To Top    #1

    Add DE after backwashing

    I just opened my pool this weekend and have been running the filter continuously to get the water clean. Given the amount of dirt and leaves in the water I've had to backwash several times and suspect I may need to do it a couple more times before it can run on a shorter schedule with more regular, less frequent backwashing. I added 6lbs. of DE (the recommended amount for the filter) when I opened the pool and have been adding DE after each backwash. The question I have is do I need to continue to add more DE after each backwash and if not, how do I know if/when to add more DE after backwashing?

    Thanks in advance for your help!
    25K Gal, IG gunite, Hayward 1HP pump, Hayward DE filter, Pentair Mastertemp 250, TF100 test kit

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Add DE after backwashing

    You do need to add DE after each time you backwash the filter. Most filters only need about 80% of the full DE charge after backwashing, since you can never get all of the DE out with just backwashing.
    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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