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Thread: Mustard or Regular Algae?

  1. Back To Top    #1

    Join Date
    Jul 2016
    Boca Raton, FL

    Mustard or Regular Algae?

    I am getting ready to SLAM my pool but I need to know if I just have regular algae or if I have mustard algae.

    I am pretty sure I have some black algae next to the skimmer.

    I have some persistent light brown/light yellow stains on the stairs and near the drain. They are not pollen as they do not come up when I brush or vacuum. However, they are pretty subtle.

    Here is my current pool chemistry:
    Free Chlorine 6.5
    Combined Chlorine 0
    Calcium Hardness 325
    Total Alkalinity 100
    CYA 60
    PH 7.2

    Pictures are attached.
    Attached Images Attached Images
    12,500 cubic foot pool
    in ground
    gunnite / Diamond Brite
    About 30 years old?
    Pool from City water

  2. Back To Top    #2
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    DFW, TX

    Re: Mustard or Regular Algae?

    I can't tell from the pics but here are a couple of articles from Pool School that should help identify it.

    Pool School - Mustard Algae
    Pool School - Black Algae
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