Check if the stain comes off with vitamin C (you can put a couple of them in a sock and rub it over the stain) If it comes off then you will be able to get rid of it with a stain treatment that has ascorbic acid. But if they are not bad, I would use something like metal free first, let your filter run 24/7 for a while. Sometimes the stains will come off, even though metal free doesn't take stains off pool surfaces, it sometimes works if the stains have not been there long. I can't answer why, but I have seen it happen. If the stain remains, you can go for the whole stain treatment. Let me know if you have any more questions, and I will be happy to help.
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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