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Thread: yellow stain on Krystal Krete

  1. Back To Top    #1

    Join Date
    May 2010
    Location
    Sarasota, FL
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    4

    yellow stain on Krystal Krete

    I have a yellowish stain on my Krystal Krete pool. I'm fairly certain it's stain, not algae because:
    -- it doesn't scrub off
    -- it has responded to a stain-analysis test (responds to iron)
    -- stain-removal products have helped somewhat in the past

    Each time I've treated I've used Pinch-A-Penny products (actually made by Jack's Magic) -- 'Iron and Cobalt Stain Removal', used with 'Ultimate Metal Control Plus' (a sequestrant), plus chlorine neutralizer necessary for the stain remover. It's expensive -- each process comes to about $75.

    A few years ago the stain treatments may have lightened the stains about 80%, but not entirely, and the number of spots has grown substantially.

    The stain removal product says it should be used with TDS <= 1,200 ppm, whereas my TDS is 2,900.

    I called in a company who acid-washed a friend's pool at a fair price with great results. The fellow who came looked at the stains and said I'd be wasting money because from experience he knows acid-washing won't remove this stain, though he couldn't tell me what the stain is. (The company also does pool resurfacing, so I could be suspicious that they'd prefer to resurface, but my friend didn't get any such redirection and they have high marks on Angie's list.)

    Present chemistry measured by Pinch-A-Penny is:

    Total Cl = 3.0 ppm
    Free Cl = 3.0 ppm
    PH = 7.5
    TA = 85 ppm
    CH = 250 ppm
    TDS = 2,900 ppm
    Salt = 2,000 ppm
    Stabilizer = 60 ppm

    The Krystal Krete has been in place since before I bought the house 8 years ago. (We love the Krystal Krete color and surface.)

    So, I'd appreciate all advice. Can this be solved or am I likely to have to resurface? If it can be solved, how?

    Thank you.
    12K gal, Krystal Krete, IntelliFlo VF, Hayward 90 sq.ft. cartridge filter, Polaris 280 cleaner w Polaris 3/4 hp booster pump

  2. Back To Top    #2
    Mod Squad Bama Rambler's Avatar
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    Re: yellow stain on Krystal Krete

    If it tested as iron then an AA treatment should remove it. If you have high iron in your fill water you'll be constantly battling it. Can you replace the water with metal free water?
    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

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    Sarasota, FL
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    Re: yellow stain on Krystal Krete

    Thank you for the reply, Bama Rambler. I've cruised this forum quite a bit but I either hadn't found the ascorbic acid treatment, or had just forgotten about it, and I've have sworn I'd searched for "iron stains", but perhaps not.

    I'd presume the Iron and Cobalt Remover I referred to would be basically the same thing, one of ascorbic, citric, oxalic. Do you think not?

    In any case, I'll try spot treatment with ascorbic acid in a sock and see if it does the job and if so proceed with an entire course.

    But, notice my description of the disclaimers on the commercial product in the presence of high TDS, which I have. Are you saying that's not material to the AA treatment?

    Thank again .... Bob
    12K gal, Krystal Krete, IntelliFlo VF, Hayward 90 sq.ft. cartridge filter, Polaris 280 cleaner w Polaris 3/4 hp booster pump

  4. Back To Top    #4
    Mod Squad Bama Rambler's Avatar
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    Re: yellow stain on Krystal Krete

    I've never heard high TDS being an issue with the AA treatment.

    Remember the sequestrant part if you do the treatment.
    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

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