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Thread: Need Help identifying what this is

  1. Back To Top    #1

    Join Date
    Apr 2014
    Madison, MS

    Need Help identifying what this is

    Hello, new pool owner here and I need help to determine what these lines and spots are in our plaster. The round dark spots are mainly in the deep end. The thin lines are in our shallow area mainly. I think the round spots are black algae. I do not know if the line like formations are a type of algae or something else. I have put Vitamin C tablets over them and nothing comes up. Chlorine tablets make it a little lighter after alot of scrubbing. Are they algae also?

    Thanks for you help.
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  2. Back To Top    #2
    Casey's Avatar
    Join Date
    Apr 2007
    SW PA

    Re: Need Help identifying what this is

    The first pic looks like rust to me.
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

  3. Back To Top    #3
    Patrick_B's Avatar
    Join Date
    Jun 2011
    Midland TX

    Re: Need Help identifying what this is

    I agree. It looks like something made of steel laid there and left a rust stain.
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