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Thread: BAD staining on fiberglass sides

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    Unhappy BAD staining on fiberglass sides

    I opened an older 1970's inground pool that had been abandoned for about 10 years. Concrete bottom, fiberglass sides. It had no chemicals added or anything done for 10 years, just natural rainwater (and we get quite a bit here in Ohio). Fast forward, rented a trash pump to get rid of large amounts of debris. Pool is in a rural area with fields and trees around it, so there was quite a bit of muck. Added the CYA, etc, and used large doses of chlorine.

    Water is now sparkling, and the concrete bottom is clean and unstained. However, the fiberglass sides are stained brown, and very stubborn. Brushing didn't even phase it, and test areas with a scotch-brite pad had minimal effect.

    I know about Jack's stain ID kit, but the water has to be at least 65-70 for accurate ID tests. This pool won't be there for months, if at all. It is poorly located between two buildings which block sun too much of the day, and no heater.

    So, how to get rid of the stains on the fiberglass? Do I super-duper mega turbo chlorinate it?
    ************************************************************ *****
    Newbie owner of TWO older (1970's) pools (pity me!)
    IG 50,000 and 30,000 gal, fiberglass walls w/ concrete bottoms, DE filters

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    Mod Squad Texas Splash's Avatar
    Join Date
    Jun 2014
    South-Central Texas, Marion/San Antonio

    Re: BAD staining on fiberglass sides

    Hello and welcome to TFP! It sounds as though you've stumbled across quite the project. Well, you might try gently rubbing a chlorine tablets in an area, being careful to not hold it in one place too long, but long enough to see if the area fades indicating it's organic in nature. You can also try some crushed vitamin C tablets in a sock and rub those on the area to see if the stains are from metal content in the water. This might help give you a good way forward for treatment. Let us know how things work-out. Nice to have you with us.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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    Mod Squad
    Join Date
    Aug 2012
    DFW, TX

    Re: BAD staining on fiberglass sides

    Welcome to TFP!

    Nice work cleaning up that pool! Show us some pics of that cool, old pool! Easiest way is to open a Photobucket account (free), upload pics, copy the IMG code to right of pic and paste it in your post.
    TFP Moderator
    If TFP helped you or saved you money - Become a TFP Supporter! <--Click here
    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    TFP Guide
    Kiss4aFrog's Avatar
    Join Date
    May 2013
    Hudson, WI

    Re: BAD staining on fiberglass sides

    Welcome to TFP LadyGoDiving
    '70s IG Vinyl 32K gal, Lazy L, Hayward SuperPump 1.5hp 120V, S240 Sand Filter W/DE
    Solar Blanket, Well Water, Borax Added, TF-100 tester. May 20 - opened for summer
    1979, 275gal Conway Emerald Spa P-100-2, ES-2 Spa Pack, bromine floater, indoor
    TF-100, Best test kit -
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  5. Back To Top    #5

    Re: BAD staining on fiberglass sides

    New Image4.jpg

    Looks like it's a metals issue. The chlorine puck test did nothing, and the vitamin C test worked wonders. So now I've ordered the ascorbic acid, and will have to work on getting the pH and chlorine levels per spec for the AA treatment.
    ************************************************************ *****
    Newbie owner of TWO older (1970's) pools (pity me!)
    IG 50,000 and 30,000 gal, fiberglass walls w/ concrete bottoms, DE filters

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