How To Remove Cobalt Stains From Fiberglass Pool

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• #i

My marvel has been piqued by plucky71's thread here. Low CH in a fiberglass pool tends to lead to cobalt staining. Why is this? I presume it'south not from dissolved cobalt in the water, or vinyl pools with depression CH would endure the aforementioned trouble.

Is cobalt used in the pigments in blue fiberglass pools? If this were the case, I would call back that people with white fiberglass pools such as plucky71, whoozer, or waterbear (and so I hear; he was before my fourth dimension) wouldn't have annihilation to worry most, but it is still universally recommended to keep a middling CH level. I guess my question is just: what is the source of the cobalt that causes the stains?

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• #2

My understanding is that cobalt is naturally occurring in water, just equally iron is. It much more than common in well h2o than municipal water, but sometimes occurs at significant levels even in municipal h2o, again just as iron does.

Different surfaces take different likelihoods of getting stains. Metal levels need to be relatively high to stain vinyl, in-betwixt to stain plaster, and can be quite low and all the same stain fiberglass. Cobalt doesn't usually occur at high enough levels to stain plaster, but fiberglass will stain at lower levels, levels that are much more than common.

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• #3

Thanks Jason. Any idea why higher CH prevents staining then? Not trying to disagree, just understand! :-D

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• #4

No idea. The "higher CH helps forestall stains" thing works simply I don't understand why it works.

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• #5

Some additional info on cobalt staining and its sources is here where they say that cobalt is present in the resin material and that high chlorine levels lead to the staining. They say that a college was end tin can prevent the staining. As for why a higher CH, or maybe a higher saturation index, seems to prevent the staining, that may exist due to protection (or slower dissolving) of the gel coat which can contain calcium carbonate.

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