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Thread: Pentair Cartridge filter and diatomaceous earth

  1. #1
    Senior Member
    Join Date
    May 2011
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    Los Angeles, CA
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    Pentair Cartridge filter and diatomaceous earth

    Hello all!

    The manual of my pentair 420 clean and clear plus (brand new installation) calls for adding some diatomaceous.

    The pool guy who installed it did not add any and says it does not need it and will clog the filter prematurely.

    What do you guys think of this?

    Thanks!
    Suley, West Hills, CA
    IG 23000 Gallons with IG Spa Gunite plaster, Pentair Intelliflo VS 3HP, Pentair Clean & Clear Plus 420 Cartridge filter, Teledyne Laars One series 400,000 BTU Nat Gas Heater, Hayward Max Flo 1HP Single Speed Spa pump, Noisy Spa blower, Dolphin Deluxe 4 robotic vacuum.

  2. #2
    Administrator JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    Re: Pentair Cartridge filter and diatomaceous earth

    It certainly doesn't require DE to work correctly. Adding DE will increase the flow resistance a little and it will also make the filter just slightly better at filtering very small particles. If you do add DE, make sure you only do so once (until you get a new cartridge.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    TFP Admin. Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. #3
    Senior Member
    Join Date
    May 2011
    Location
    Los Angeles, CA
    Posts
    223

    Re: Pentair Cartridge filter and diatomaceous earth

    Thanks!
    Suley, West Hills, CA
    IG 23000 Gallons with IG Spa Gunite plaster, Pentair Intelliflo VS 3HP, Pentair Clean & Clear Plus 420 Cartridge filter, Teledyne Laars One series 400,000 BTU Nat Gas Heater, Hayward Max Flo 1HP Single Speed Spa pump, Noisy Spa blower, Dolphin Deluxe 4 robotic vacuum.

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