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Thread: Yellow Stain in Spa

  1. Back To Top    #1

    Join Date
    Feb 2017
    El Paso, TX

    Yellow Stain in Spa

    Last night I noticed I had a yellow stain in my spa (which is attached to my poo) that wouldn't brush off. After doing some research, I placed a chlorine tab directly onto the stain and the stain lightened up.

    Today, when I checked the stain was gone on that spot but a new spot appeared ( see attached picture).

    The pool water looks great and the numbers are as followed:

    Test from today:

    FC: 6
    CC: 0
    pH: 7.8
    TA: 80
    CYA: 40
    CH: 320

    As you tell from the picture, I went ahead and drained the spa. Is the stain algae? And how should I get rid of it and prevent it from coming back?

    Thanks for the advice.
    Plaster, 2 HP WhisperFlo Pump, DE Filter

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

    Re: Yellow Stain in Spa

    If the puck cleared up the stain then it is organic. More here, Pool School - Pool Stains

    You can do an Overnight Chlorine Loss Test to see if you have some algae growing. If so, then SLAM to kill the algae.
    TFP Moderator
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