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Thread: White, milky substance in filter

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    White, milky substance in filter

    I cleaned my filter and there was a white, milky substance in the filter. When it dried on my concrete it looks like sand. What is this? Should I be concerned. The pool chemistry is balanced and the pool is clear.
    Houston-area (Katy, TX)
    10,000 inground plaster pool
    1.5 HP, 2-speed Hayward
    Cartridge Filter
    400k BTU gas heater
    E-Command 4 automation

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    Join Date
    Dec 2010
    San Diego, CA

    Re: White, milky substance in filter

    What kind of filter do you have?
    15,600 Gallon, 16' x 32' In-Ground Vinyl Pool
    Pentair VS 3050 pump, Quad DE 60 filter and SunTouch controller
    8 gallon Liquidator, Aquatherm EcoSun Solar Panels, 2 wheel ThePoolCleaner

  3. Back To Top    #3
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: White, milky substance in filter

    Post a full set of test results and how you got them.

    The white stuff could be calcium but without the numbers, it's impossible to tell what it might be.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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