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Thread: Dark patchy stains

  1. Back To Top    #1

    Join Date
    May 2011
    Los Angeles, CA

    Dark patchy stains

    Hi all!

    Now that I think i have the basics down, I am looking at the stains in my pool....

    I have dark patches like dirt marks on my pool floor. I did the Vit C test and it did not remove them...actually the patch i tried the Vit C pill on turned yellowish...

    Any ideas how to tackle the stains?

    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. Back To Top    #2
    Melt In The Sun's Avatar
    Join Date
    Oct 2009
    Tucson, AZ

    Re: Dark patchy stains

    Sounds like the vitamin C was having an effect. Try leaving it on there longer just to be sure, but it sounds like iron stains. See these:
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
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  3. Back To Top    #3
    Butterfly's Avatar
    Join Date
    May 2007
    South Carolina

    Re: Dark patchy stains

    How large are the stains? Just a few or all over the whole pool?

    Got pics?
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

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