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Thread: I need help!!! Newbie with stains.

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    I need help!!! Newbie with stains.

    I need help!!! Newbie with stains. I did the vitamin c test and had a clean spot so I ordered ascorbic acid, took the chlorine down to zero, treated with 10 lbs of ascorbic acid (I went slowly at first, no change so kept adding more). PH is now 7.2, total alkalinity 180 water is cloudy and the stains look worse. The pool is 35000 gallons, I do fill with well water and I use a nature 2 cartridge. The pool was replastered about 4 years ago and the stains are a couple of years old, they were not real bad. (they are now) If the stains are not metal...what are they?

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    lee872's Avatar
    Join Date
    Aug 2012
    Central Massachusetts

    Re: I need help!!! Newbie with stains.

    I'm too new at this myself to suggest next steps, but I can offer reassurance that the cloudy water will improve even though you can't shock. I did the AA treatment last week, and my pool turned milky-cloudy as soon as I added the sequestrant. It got worse in the first 24 hours -- I could barely see bottom in the shallow end -- and then started gradually improving. By day 6 it was 95% clear -- basically clear but not as sparkling as it should be. I added SeaKlear that day. It's now day 8 and pool is clear. I'm haven't yet passed the OCLT, but I'm close. Only lost 1 ppm last night.
    35,000 gallons - inground vinyl liner -- sand filter - 1 HP, 50.76 GPM - Aqua Rite T-Cell 15 SWG - Dolphin Apollo Plus - TF-100

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    linen's Avatar
    Join Date
    Jul 2010
    Twin Cities, MN

    Re: I need help!!! Newbie with stains.

    Welcome to tfp, KMX8YK

    Have you reviewed this pool school article?:

    Did the stains become worse during the AA treatment, or after? If during, it is possible that you may have algae as well. If after, did you add an sequestrant at the appropriate time like the above article mentions?

    I would stop using the Nature2 since that is adding metal to your water...which obviously you don't want!
    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: I need help!!! Newbie with stains.

    Thanks for the quick response! I did review the article and did read all 5 pages of message thread related to the ascorbic acid treatment. The stains became almost black in some places immediately upon adding the acid, on the sides as well as ledges. Brushing had no effect, they lightened up just a bit in the ensuing days but they still look hideous. Although the acid did not remove any stain, I did add a bottle of sequestrant after the second dose of 5 lbs. The ph was 7.6 when I began, it went down to 7.2 after the first treatment but remained at 7.2 after the second treatment.Why would the PH not budge after adding that much acid? I have never had an algae problem, am pretty diligent about maintaing the chlorine level, free cholrine is usually ok and with the nature 2 I would have thought there should not be an algae problem??(I do realize if in fact the stains are metal, the nature 2 would be contributing and would get rid of it). I saw a picture in another post, the problem was identical but I did not see where he had resolution. Organic stains would come off with enough chlorine and brushing, right? I cant seem to find information on stains other than those 2 topics.

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    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: I need help!!! Newbie with stains.

    If the stains are not metal...what are they?
    Organic. Place a tri-chlor puck on the stains for a few minutes and judge the reaction. If the stain lightens up a lot or disappears, then the stain is organic. If that fails, then crush up vitamin C tabs, put them in a sock and hold the sock directly on the stain for a few minutes. see if it lightens it or not.....that'll confirm metal stains if it lightens.

    They are probably metal but you must correctly identify them first.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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