Re: Is it a stain, or my lying eyes?
No, your eyes are not playing tricks on you - it probably is a mineral stain. You can take some vitamin C tablets and crush them up in a sock, or ph down, and rub it on the stain - if it takes it up it is a mineral stain. You can take your ph down to 7 - 7.2 and put in some metal remover (sequestering agent) and it should lift the stain. Let us know if this takes care of the problem. I have a fiberglass pool, and if it has stains you mostly see them in the pool when there is no sun on them.
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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