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Thread: Tan-ish colored stains on fiberglass that are rough

  1. Back To Top    #1

    Join Date
    Nov 2009
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    MS Gulf Coast- Katrina Survivor - BP Hater!
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    Tan-ish colored stains on fiberglass that are rough

    I use well water and have had these stains off and on for years. I use about 4lb of citric acid to remove them and the water sparkles and pool is beautiful when finished. Chlorine use is high for a few days after treatment and I aireate w/ jets, water fall and slide to bring ph up. I've tried several sequesterants, Regal Metal Out, Aquachem Metal and Scale, etc. and I don't see where they help. I use a TF100 and have to use the copper method to test ch. I wanted to have it tested for metal today but since it's stained now, the metals may not show on a test. I don't get any rain water and I use bleach.
    Any ideas?
    fc-6
    cc-.5
    tc-6.5
    ph-7.6
    ta-140
    ch-110
    cya-50
    temp-88

    My well water is:
    ph-7.3
    ta-220
    ch-60

    Even if I test + for metals which is probably a given, what's a treatment that may work?
    15,000 gal Sun Fiberglass, Glass/Lexan/Aluminum Enclosed Room, 1.5 hp Pentair Whisperflow Pump, Triton 100- 600# Sand Filter, Heat Siphon Heat Pump, 3 Dbl. Seats w/8 Jets, Waterfall, 8' Interfab Slide, Pentair SAm Spectrum Amerlite Pool Light, Stenner MHP5 Chlorine Pump, Kreepy Krauly Vacuum, Bleach, 50 ppm Borates, TF 100 Test Kit

  2. Back To Top    #2
    JasonLion's Avatar
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    Silver Spring, MD
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    Re: Tan-ish colored stains on fiberglass that are rough

    The idea behind sequestrants is that they bind to the metals and prevent them from forming stains. Sequestrant breaks down slowly, so you need to constantly add more to replace the portion that has broken down recently. If you use the correct dosage of a good quality sequestrant and maintain it, you won't get any new stains.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3

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    Re: Tan-ish colored stains on fiberglass that are rough

    Any suggestions on brand? I've used the ones I listed as recommended and even on the heavy side without satisfactory results.
    15,000 gal Sun Fiberglass, Glass/Lexan/Aluminum Enclosed Room, 1.5 hp Pentair Whisperflow Pump, Triton 100- 600# Sand Filter, Heat Siphon Heat Pump, 3 Dbl. Seats w/8 Jets, Waterfall, 8' Interfab Slide, Pentair SAm Spectrum Amerlite Pool Light, Stenner MHP5 Chlorine Pump, Kreepy Krauly Vacuum, Bleach, 50 ppm Borates, TF 100 Test Kit

  4. Back To Top    #4
    JasonLion's Avatar
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    May 2007
    Location
    Silver Spring, MD
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    37,879

    Re: Tan-ish colored stains on fiberglass that are rough

    ProTeam's Metal Magic and Jack's Magic the Pink Stuff (regular), the Blue Stuff (fresh plaster), and the Purple Stuff (SWG) are some of the top sequestrants. You can also find many other brands with similar products, some of which are noticeably less expensive. Sequestrants based on HEDP, phosphonic acid, or phosphonic acid derivatives are the most effective.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  5. Back To Top    #5

    Join Date
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    MS Gulf Coast- Katrina Survivor - BP Hater!
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    Re: Tan-ish colored stains on fiberglass that are rough

    Thanks for the info.
    SWG is the next project and may be soon!
    15,000 gal Sun Fiberglass, Glass/Lexan/Aluminum Enclosed Room, 1.5 hp Pentair Whisperflow Pump, Triton 100- 600# Sand Filter, Heat Siphon Heat Pump, 3 Dbl. Seats w/8 Jets, Waterfall, 8' Interfab Slide, Pentair SAm Spectrum Amerlite Pool Light, Stenner MHP5 Chlorine Pump, Kreepy Krauly Vacuum, Bleach, 50 ppm Borates, TF 100 Test Kit

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