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Thread: Mystery Stain

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    Join Date
    Dec 2011
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    Mystery Stain

    For a better part of the summer I have had a mystery stain in a 4x6 area of the pool. the stain is faint, blotchy, green to tan in color and climbs the corners up onto the wall. I'd have said that it hasn't spread or changed at all, but i am now noticing a small similar stain in another, deeper area of the pool. The stain does not appear to brush off at all, and the initial area doesn't seam to grow or change.

    During the summer, my water has been clear, and ,in general, has been maintained in recommended specs. There was a period, however this past spring where things got out of control.

    I have shocked several times and have seen no change in the area. currently, I am shocking again, and brushing the area daily. Does anyone have any suggestions or recommendations as to what this is or how I can treat it? I have tried to take photos, but no matter what angle I use, they don't really come out well.

    Thanks, Chris

    Currently
    pH7.5 (FYI it CHRONICALLY rises to 8.2)
    FC17.5
    CC 0.5
    TA 60 (store says 100)
    CYA 25 (store says 60)
    CH 450 per the store (I can't ever seem to get a color change in my test kit)
    Built 2012: 14x28' free formed IG gunite with 4 person spa. 11,000gal, Hayward 2 speed Tristar pump, Hayward 420sq ft cartridge filter , auto tablet chlorinator (I use BBB), 250BTU Hayward heater, quartz pebble finish, LED lighting

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    Mod Squad YippeeSkippy's Avatar
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    Re: Mystery Stain

    How about grabbing a handful of Vitamin C tablets and holding them against the stain to see if it changes it. If it is a metal stain it should improve under the Vit C.
    My Amazon Smile for November12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
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    Swampwoman's Avatar
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    Re: Mystery Stain

    ...and posting a pic if possible....
    In ground extended Grecian, 22,000 gal, Hayward 220t sand filter, vinyl liner, dolphin m4 supreme.
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    Re: Mystery Stain

    It took me a few days to accomplish, but it appears as though the Vitamin C tablet DID remove the stain where I rubbed it. As I indicated, the pictures are difficult to see, but you can jus make out the shadow of the blotchy stain.
    IMG_6475.jpg
    IMG_6477.jpg
    Built 2012: 14x28' free formed IG gunite with 4 person spa. 11,000gal, Hayward 2 speed Tristar pump, Hayward 420sq ft cartridge filter , auto tablet chlorinator (I use BBB), 250BTU Hayward heater, quartz pebble finish, LED lighting

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    Mod Squad kimkats's Avatar
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    Re: Mystery Stain

    I see it. I am glad to hear the Vit. C worked!

    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

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    Richard320's Avatar
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    Re: Mystery Stain

    If Vitamin C lifted it, it's metals. Could be that someone used copper algaecide in the past, or some kind of miracle low-chlorine-patented-unique-but-not-really metal ion system. Or even worse... you drove the pH super low using trichlor for so long that you dissolved the innards of the heater. Pool School - Metals in the Water and Metal Stains
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Re: Mystery Stain

    Thank you folks!

    Richard ,

    Thank you. i am going to confirm once more with a larger dose of the vitamin c. I am going to fill a sock full of crushed tablets and sit it on the stain. All of those causes you mentioned seem implausible. Are there other ways that I could be seeing metals, or is it less likely that I have metal? The pool is 3 years old and has never had algaecide or had tricolor. I am the only owner. My struggles with pH are only that it is CONSTANTLY on the rise. i add Acid every couple of days. Incidentally, right in the location of that stain.

    Thanks
    Built 2012: 14x28' free formed IG gunite with 4 person spa. 11,000gal, Hayward 2 speed Tristar pump, Hayward 420sq ft cartridge filter , auto tablet chlorinator (I use BBB), 250BTU Hayward heater, quartz pebble finish, LED lighting

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    Mod Squad kimkats's Avatar
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    Re: Mystery Stain

    Quote Originally Posted by boston2austin View Post
    i add Acid every couple of days. Incidentally, right in the location of that stain.

    ???????????? I do think we have a clue here!!!!!!!!! Not sure what the clue says but...........it is a clue! LOL

    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

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    Re: Mystery Stain

    i add Acid every couple of days. Incidentally, right in the location of that stain.
    I do not believe that stains are caused by acid. I thought it was possible that acid additions and chlorine could possibly cause a chemical reaction and could cause staining, rust, etc.

    Chem-Geek confirmed in a very long thread, this is not the case and that PH, if allowed to drop very low could cause problems as water becomes very corrosive. MA should be added to the pool just as if it were chlorine, in front of a return to shoot in the pool. I have found the smallest stains on my white steps, and even Vitamin C does not remove them. Have no idea how they show up. There are no metals in my water either (tested many times). Chances are that the stains are related to something else.
    14,700 gallons IG Pool Vinyl Liner - Octal Circulation System
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    Mod Squad kimkats's Avatar
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    Re: Mystery Stain

    Well darn! Hummmmmmmmmmmmm it is right in front of the return so........could be something coming out of the filter or just how the sun does or does not hit that spot in the pool??????????

    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

  11. Back To Top    #11

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    Re: Mystery Stain

    Feel the plaster in the area. If it's rough in the area of the "stain" then that may not be a stain so much as plaster deteriorated from the acid. Rough plaster can look darker and can also get algae more readily.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
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