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Thread: Yellowish Stain on Ganite Pool

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    Yellowish Stain on Ganite Pool

    I have a yellowish rusty stain in a few spots in my pool on the walls. It is a ganite, 20K gallon pool, newly finished last year. All the chemicals are testing correctly and also tested correctly at pool store, and pool is very clear. I tried the Mustard Algae solution from the pool store yesterday, but no change. Any recommendations? Thanks in advance.

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    JasonLion's Avatar
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    Re: Yellowish Stain on Ganite Pool

    Try placing a vitamin C tablet on the stain for 30 seconds to a minute and see if the stain fades or vanishes. If it does then it is an iron stain, either from iron in the water or from an iron bearing inclusion in the natural stone, and can be removed locally with vitamin C or everywhere with an AA treatment.
    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

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    Re: Yellowish Stain on Ganite Pool

    Where do you get Vitamin C tablets? Do they come in the size of the clorine bricks, 3"? What is an AA treatment? Thanks for the suggestion and help. Sorry for all the questions.

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    JasonLion's Avatar
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    Re: Yellowish Stain on Ganite Pool

    Vitamin C tablets are easily found in the grocery store in the vitamin section. Try the test first before worrying about an AA treatment.
    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

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    Re: Yellowish Stain on Ganite Pool

    I didn't notice any change in the stain with the vitamin C. I had some Algaezone plus, which I put a few ounces in the pool to see if that does anything. Very frustrating since I had the ganite refinished last season and getting this yellow stain now. Hopefully see a difference tomorrow.

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    Re: Yellowish Stain on Ganite Pool

    I understand your pain... I also had my 22k gallon gunite pool replastered last fall then closed for the season. I have a yellowish/brownish stain on a large section of my pool floor also. I tried the chlorine puck and Vitamin C experiments which showed no effects to me or my wife's eye. When I had my plaster redone I also had my concrete coping replaced with natural rock of a orangish/brownish color which I am wondering if it has some iron inclusions which has stained the pool floor. Needless to say I am planning on giving the pool a citrus acid treatment in the next couple of weeks to see if that wont at least lighten the stain. Either way again I understand your pain...
    20K gal, IG Gunite, 1.25 HP Centurion pump, 60 Gpm Tagelus Sand filter

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    linen's Avatar
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    Re: Yellowish Stain on Ganite Pool

    tdean,

    Since the vit c did not show anything, the next step is probably to post a full set of test values. See this post: http://www.troublefreepool.com/what-...ns-t10341.html
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: Yellowish Stain on Ganite Pool

    I retried the vitamin C and let it sit a lot longer and the area that it was looks bluer. Now since the stains is in a large areas i cannot just place Vitamin C tablets throughout the pool. What is the AA treatment? Should i try that? The side of the pool that has the stains, has trees that drop leave, branches and acorns. It seems like when the acorns fall in the water, I get more stains from that. Could that be the cause?

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    Re: Yellowish Stain on Ganite Pool

    Quote Originally Posted by Hawgzilla
    I understand your pain... I also had my 22k gallon gunite pool replastered last fall then closed for the season. I have a yellowish/brownish stain on a large section of my pool floor also. I tried the chlorine puck and Vitamin C experiments which showed no effects to me or my wife's eye. When I had my plaster redone I also had my concrete coping replaced with natural rock of a orangish/brownish color which I am wondering if it has some iron inclusions which has stained the pool floor. Needless to say I am planning on giving the pool a citrus acid treatment in the next couple of weeks to see if that wont at least lighten the stain. Either way again I understand your pain...
    Did you try the citric acid treatment? Did it work? What does it entale?

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    linen's Avatar
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    Re: Yellowish Stain on Ganite Pool

    Quote Originally Posted by tdean
    Did you try the citric acid treatment? Did it work? What does it entale?
    See this poolschool article, there is a link in it to the AA treatment process: http://www.troublefreepool.com/pool-...metal%20stains
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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