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Thread: Can't figure out what this is...

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    Can't figure out what this is...

    Hi Folks,
    First up, great forum and site! I've learned so much just from reading. But now I have an issue of my own and I don't know if it's algae or some type of corrosion. So I finally decided to break out my gopro and take some photos. I hope they're clear enough.
    So, I've tried slamming the pool several times, always keep my chemistry balanced, even CYA in the 50 to 80 range (not great but I'm in the middle east so the sun is pretty intense). No matter what I do, even vigorous scrubbing by hand, it does not go away. The pool I think is fiberglass with a gelcoat finish, does this make sense? To make matters worse, I believe now it may have been painted as well with some heavy duty epoxy marine paint.
    Please have a look at the photos and let me know. I'm thinking now to just drain it and pressure wash the whole thing and start from scratch.
    Thanks,
    Nick

    G0165616.jpg

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    18,000 litre In-ground Pool - Firberglass with gelcoat finish?
    Sand Filter, Pentair chlorine feeder

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    Mod Squad pooldv's Avatar
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    Re: Can't figure out what this is...

    Welcome to TFP!

    Try some Vit C to see if it removes the stain. More here on how to do that, Pool School - Stains in Your Pool
    TFP Moderator
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    Re: Can't figure out what this is...

    OK cool, thanks. I'll give that a try and report back.
    18,000 litre In-ground Pool - Firberglass with gelcoat finish?
    Sand Filter, Pentair chlorine feeder

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    Re: Can't figure out what this is...

    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: Can't figure out what this is...

    Cobalt Spotting - Solve My Pool Problems, try thishttp://www.poolstore.com/cobalt-cure-stain-remover-for-fiberglass-and-acrylic-pools-and-spas

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    Re: Can't figure out what this is...

    Looks like it’s a tiled pool that was painted. Tile is the only thing that will give those squares.

    I don’t know what the spots are.

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    Re: Can't figure out what this is...

    Why would anyone paint a tiled pool?? Hope you can solve your issue! I'm no help but am interested in what's under that paint!
    Marla
    No longer living vicariously through other people's pool builds. Pool build is complete on my IG SWCG pool, approx 10,000 gallons. All Jandy equipment - VS 1.5 hp pump, 580 cartridge filter, AquaPure 1400 salt cell, AquaLink PDA system. Dolphin m500. PebbleSheen Blue Surf with shells and beads added. TF-100 w/ SpeedStir. A Houston Pool Build Inside the Loop

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    Re: Can't figure out what this is...

    Maybe they didn't like the color of the tile?

    Perhaps they wanted plain white but the tile was dark.

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    Mod Squad kimkats's Avatar
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    Re: Can't figure out what this is...

    In to watch and learn from this one. Once you do the vit. c test let us know what happens.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit, Become a TFP supporter!

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    Re: Can't figure out what this is...

    Thanks everyone for the input. So I got home tonight and grabbed one of my 500mg vit-c supplement tablets, put it in the pool right on top of one of the stains. I was amazed. Within a minute the stain was 90% gone, plus an inch or two around the tablet was a nice bright blue.
    Looking a bit closer, I see this is definitely a fiberglass pool and I don't believe now that it was painted. Even though the surface is bubbling, the bubbles are hard as the surrounding area and scraping it just gouges the surface. Reading some more on this forum and following suggestions from some responding here, it could be a cobalt staining issue. Just now need to try and track down the appropriate products to help resolve the issue.
    18,000 litre In-ground Pool - Firberglass with gelcoat finish?
    Sand Filter, Pentair chlorine feeder

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    Mod Squad kimkats's Avatar
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    Re: Can't figure out what this is...

    I would LOVE to see a pic or 10 of the whole pool and area. Fiberglass with that pattern? Sounds interesting!

    Have you read what you need to get to clear it up or do you need to be pointed in the right direction? We are here to help you out if needed.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit, Become a TFP supporter!

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    Re: Can't figure out what this is...

    Sure, I'll try to get some pics later this week. Too dark now for any good ones. I'm still working on the right solution at the moment. I'll have to call the local pool store and see what they have to offer and work with the products they have. Getting anything pool related here in Abu Dhabi is very difficult!
    18,000 litre In-ground Pool - Firberglass with gelcoat finish?
    Sand Filter, Pentair chlorine feeder

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    Mod Squad kimkats's Avatar
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    Re: Can't figure out what this is...

    Ascorbic Treatment to rid Pool of metal stains

    See if this helps. Can you find anything like this there? It does not have to be a "pool product". That is the beauty of TFP!

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit, Become a TFP supporter!

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    Re: Can't figure out what this is...

    Ok thanks, I will try and find the absorbic acid.

    - - - Updated - - -

    It will be difficult as well, but I'll try.
    18,000 litre In-ground Pool - Firberglass with gelcoat finish?
    Sand Filter, Pentair chlorine feeder

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    Re: Can't figure out what this is...

    How do you get that tile pattern with fiberglass?

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    Re: Can't figure out what this is...

    If the stains responded to vitamin C, it is surely not cobalt. Please reread this excerpt from the link provided...
    Iron
    In the vast majority of pools metal staining comes from iron. Iron is fairly common in well water but rare in municipal water. If you suspect a stain is caused by iron try the Vitamin C test. Place 15 to 20 Vitamin C tablets in a sock and crush them. Hold the sock on the stain for 3 to 5 minutes. If the stain vanishes or lightens then it is iron.

    You can remove iron stains with ascorbic acid (Vit C). See this article, Ascorbic Treatment to rid Pool of metal stains, for directions on how.

    If iron has precipitated into the water, turning it orange, brown, yellow or green, it is sometimes possible to filter out the iron particulates using polyfill pillow stuffing material. Polyfill can be used by stuffing it in a skimmer basket or making a separate bucket filter filled with polyfill and circulating water through it, replace it often.

    If your fill water has iron then consider trucking in iron-free water to fill the pool. Also consider capturing rain water or diverting gutters to the pool as an iron-free source of water for replacing evaporation and water loss.
    Please treat your pool for iron stains with ascorbic acid. It's pretty easy to find online but I don't know if anyone in the US will ship to you.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Can't figure out what this is...

    Ok Thanks. That's my plan, to stick with the ascorbic acid treatment. I'm sure I'll either find it locally or find someone to ship it. I still have a few days to wait though as my chlorine levels are still at shock level.
    18,000 litre In-ground Pool - Firberglass with gelcoat finish?
    Sand Filter, Pentair chlorine feeder

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    Re: Can't figure out what this is...

    Quote Originally Posted by kadavis View Post
    Cobalt Spotting - Solve My Pool Problems, try thishttp://www.poolstore.com/cobalt-cure-stain-remover-for-fiberglass-and-acrylic-pools-and-spas
    Be cautious with the recommendations on that website. They recommend a FC of 5% of CYA (5ppm FC to 100ppm CYA) to battle algae, and large additions of cal-hypo with no warning that excessive calcium will lead to CSI issues and scale.

    They also state that green murky water is a filtration issue, and recommend a complete drain & refill.

    None of that is necessary, and frankly, quite wasteful.

    We do not advocate mixing pool care methods, as that will usually end with frustration.

    As already mentioned, this is iron staining as it reacts to AA.
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