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Thread: Quarter sized oval shaped ringed rust stains on bottom of pool . . .

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  1. #1
    mbar's Avatar
    mbar is offline Lifetime Member Whizbang Spinner mbar 3 stars mbar 3 stars mbar 3 stars mbar 3 stars
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    Default Re: Quarter sized oval shaped ringed rust stains on bottom of pool . . .

    I don't know why, but rust does not seem to come off with ascorbic acid. You can try using a stain stick, or some fine sand paper to rub the stain. It will take off some of the surface, but not enough for it to matter and it will get rid of the stain. You can also contact Jack's Magic, and ask them. They should be able to answer the question.
    Northeast PA
    16'x32' kidney 16K gal IG fiberglass pool; Bleach; Hayward 200lb sand filter; Hayward pump; 24hrs; Pf200; well; summer: none; winter: mesh; ; PF:7.5

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    chem geek is offline PF Supporter Whibble Konker chem geek 4 stars chem geek 4 stars chem geek 4 stars chem geek 4 stars
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    Default Re: Quarter sized oval shaped ringed rust stains on bottom of pool . . .

    I contacted Jack's Magic and I must say that these guys are quite knowledgeable about stains (even knew some chemistry, which surprised me). Anyway, for rust they recommend an oxidizer first (they use something that sounds similar to a non-chlorine shock like KMPS except higher in oxygen content) and then a stain remover that sounds like dry acid (possibly sodium bisulfate). I'll get some of their products and see what happens and let you know. I suspect that ascorbic acid just isn't strong enough by itself.

    Richard

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    waterbear is offline Lifetime Member Sniggle Mechanic waterbear 4 stars waterbear 4 stars waterbear 4 stars waterbear 4 stars
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    Default Re: Quarter sized oval shaped ringed rust stains on bottom of pool . . .

    If ascorbic acid doesn't work on rust then oxalic acid might. It is a commen treatment for rust stains outside of swimming pools and is the ingredient in some pool stains revmovers such as 'Stain Treat'.
    Richard, Jack's Magic knows their stains! They don't list the ingredients in their MSDS, however but I suspect that the oxidizer that they use is sodium percarbonate.
    Retired pool store and commercial pool maintenance guy.

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