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Thread: Yellow Spots on my Filter Cartridges

  1. Back To Top    #1

    Join Date
    Jul 2010
    Location
    Pt. Arthur, TX
    Posts
    174

    Yellow Spots on my Filter Cartridges

    So I've been fighting an algae problem for a couple of weeks now. As you know, part of the process includes cleaning my filter. I noticed some yellow spots on my filter, figured they were from some algae growth.

    I figured keeping my pool at shock levels would eventually kill that as well. So I sprayed the filters as clean as I could put everything back together & continued the process.

    Well, I've had to clean my filters three times in this two week period & the yellow spots haven't cleared up much if at all.



    The kicker though, that picture was taken yesterday. Last night was the first time I passed the overnight test (even though my water is still a bit cloudy).


    So, what do you think? Is that algae growing on my filter or is something else going on?
    Custom Cloud shaped 19'x35' - Raised Spa 6' diameter
    Rainbow 320 Inline Chlorinator - Paramount Clear O3 Ozone Generator
    Hayward C4025 Cartridge Filter (Hayward CX880XRE) - Hayward Tristar 2 speed pump
    Hayward H400Fdn Heater, Hayward GVA-24 (valve actuators)

  2. Back To Top    #2
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,333

    Re: Yellow Spots on my Filter Cartridges

    Looks like iron stains to me. You could rub a vitamin C tablet on it and see if that lightens it. If so, they're metal stains.
    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

  3. Back To Top    #3

    Join Date
    Jul 2010
    Location
    Pt. Arthur, TX
    Posts
    174

    Re: Yellow Spots on my Filter Cartridges

    Thanks Bama, I'll give it a try
    Custom Cloud shaped 19'x35' - Raised Spa 6' diameter
    Rainbow 320 Inline Chlorinator - Paramount Clear O3 Ozone Generator
    Hayward C4025 Cartridge Filter (Hayward CX880XRE) - Hayward Tristar 2 speed pump
    Hayward H400Fdn Heater, Hayward GVA-24 (valve actuators)

  4. Back To Top    #4

    Join Date
    Feb 2008
    Location
    Denton, TX
    Posts
    5,061

    Re: Yellow Spots on my Filter Cartridges

    Got them on mine too.

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