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Thread: Trying to rid my plaster pool of a large amount of staining

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    Trying to rid my plaster pool of a large amount of staining

    Hello,
    I need help. I have tried a few things to rid my plaster pool of a large amount of staining. I most recently tried the vitamin C test and saw the stain was lifted where the tablet was so I tried the ascorbic acid. After adding the ascorbic acid, the stains remain the same. I have attached photos of the stains. Any suggestions?

    Thanks
    Attached Images Attached Images

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    JasonLion's Avatar
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    Re: Trying to rid my plaster pool of a large amount of staining

    Ascorbic acid will not remove all stains, only some of them. Did you try holding a vitamin C tablet against the stains for 30 seconds before doing the ascorbic acid treatment? And did it affect the stains?
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Trying to rid my plaster pool of a large amount of staining

    I placed the vitamin C tablets on the steps where there are stains. It removed the stains as the tablets disolved, but not immediately

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    Guest

    Re: Trying to rid my plaster pool of a large amount of staining

    Have you ever used a copper based algaecide, do you have a heater, or do you know if there are metals in your water?
    THe stains look like either manganese or copper. Ascorbic acid should work on manganese but not necessarily on copper. It would also be helpful if you could post a full set of test results.

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    Re: Trying to rid my plaster pool of a large amount of staining

    I will get results from a water test at my local pool company and post it later today. How can you tell if an algaecide is copper based..and is there any way to get rid of copper stains?

    Thank you so very much!

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    Guest

    Re: Trying to rid my plaster pool of a large amount of staining

    Quote Originally Posted by lwoods941
    How can you tell if an algaecide is copper based
    It will list copper sulfate or chelated copper on the ingredients or it will be a "three month' algaecide or possibly a black algae killer or mustard killer (although other things besides copper are marketed as these kinds of algaecides also)



    ..and is there any way to get rid of copper stains?
    Usually acid washing the pool. Sometimes copper stains can be treated in the pool but the procedure can take weeks and the pool is closed during the treatment. Also, heaters need to be bypassed since the treatment lowers the pH of the water by quite a bit. It is, in effect, a no drain acid wash with strong reducing agents in the water.
    Thank you so very much!

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    Re: Trying to rid my plaster pool of a large amount of staining

    Hello again,

    I got my water tested.

    PH = 7.2
    Calcium= 120
    Alkalinity = 100
    Chlorine = .5
    Copper = .2
    Iron = 0

    The pool company suggests adding "Super Erace" again which I did in the past with no results. This will also take the copper out of the water. I do have a heater. I can't see an active ingredient in the "Super Erace" but it is made by the Phoenix company.

    Thank you

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    Guest

    Re: Trying to rid my plaster pool of a large amount of staining

    I am going to guess you chlorinate with trichlor tabs and you have had more than one instance where your pH has 'crashed' and the pool was acidic. It is close to that now. I suspect this is the source of your copper. Sequesterant will deactivate the copper in the water but will not remove it. However, sequesterant breaks down and needs to be added as a weekly to monthly maintenance chemical when there are metals present.
    You are probably going to have to acid wash to get rid of the stains. I suggest you click on the pool school link in the uppper right corner of the page and start learning how to care for your pool properly.

    Why did you NOT get a test result for CYA? Why is your CH so low with a plaster pool?
    You really need to take control of your pool. It's not hard as everyone on here can attest to.

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    Re: Trying to rid my plaster pool of a large amount of staining

    My pool is not usually this out of control. I lowered the chlorine because I just put in the ascorbic acid which lowered the PH.

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    frustratedpoolmom's Avatar
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    Re: Trying to rid my plaster pool of a large amount of staining

    Quote Originally Posted by lwoods941
    Hello again,

    I got my water tested.

    PH = 7.2
    Calcium= 120
    Alkalinity = 100
    Chlorine = .5
    Copper = .2
    Iron = 0

    The pool company suggests adding "Super Erace" again which I did in the past with no results. This will also take the copper out of the water. I do have a heater. I can't see an active ingredient in the "Super Erace" but it is made by the Phoenix company.

    Thank you
    I wouldn't use it.... if it didn't work before, it likely won't work now.

    Please see the article - Recommended Levels in Pool School. I would agree that an acid wash it probably your last option at this point, and once you do that, be sure to keep your levels in range for your pool - so get the CH level up to the recommended range and confirm your CYA level.

    I would recommend you get your own test kit, there is an article in Pool School that compares them.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
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    Join Date
    May 2009
    Location
    Denver, Colorado
    Posts
    12

    Re: Trying to rid my plaster pool of a large amount of staining

    I have the same type of stains. We finally all concure that they are copper stains. My PB is acid washing on Monday.

    It has been a very long, expensive, and frustrating trail! see my pics
    no-stains-until-salt-was-added-t14936.html
    19,400 Gallon Outdoor In-Ground 18x38 Plaster Pool w/ Intellichlor SWG, Pentair Whisper Flo 1 HP, Pentair Triton C Sand Filter

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