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Thread: bluish dark green stain on gout line above water level

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    bluish dark green stain on gout line above water level

    Hi all,

    Need the expert help here. This is a SWG pool. It is seen above water line and appearing in more area slowly. Tried rub it with the trichlor puck for about a minute but no help.
    The pool was built last year. Tested the water with metal but none found. Will try Vitamin c tablet as soon as I find any. Pool was always clear.
    pH 7.8
    TA 70
    CH 325
    CYA 25-- adding more now
    FC 3
    CC 0

    Thank you for any suggestion, advices!
    [attachment=1:2xqq84bu]20130416_170723_resized.jpg[/attachment:2xqq84bu]
    [attachment=0:2xqq84bu]20130416_170813_resized.jpg[/attachment:2xqq84bu]
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    duraleigh's Avatar
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    Re: bluish dark green stain on gout line above water level

    Usually efflorescence is white but that's what it might be where minerals migrate to the surface from underneath the grout and tile. Try a 3:1 dilution of muriatic acid and water. If it foams, that will clean it.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: bluish dark green stain on gout line above water level

    Thanks for the suggestion. Will try that when the rain stops.

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    Re: bluish dark green stain on gout line above water level

    I just tried the aicd method. It starts to foam and the stain turn back. Does not look like it will come off even after scrubing it. Will the stain ID kit help me? Thanks!

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    Mod Squad Bama Rambler's Avatar
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    Jun 2009
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    SouthWest Alabama
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    22,347

    Re: bluish dark green stain on gout line above water level

    If the stain turns black when you put acid on it, that sounds like copper staining. You can try rubbing a vitamin C tablet on it and see what that does.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: bluish dark green stain on gout line above water level

    Finally got the chance to rub some vitamin c tab on it, it kinda of lighten it little but it could be just the vitamin c powder residual on them. What should I expect to see if this is copper stain? Will the vitamin c remove all the stain if this is copper. Thanks for all the help I can get.

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