Please see attached pictures. Any idea on how to treat these brown spots and brown ring around water line of the fiberglass pool? Also, maybe what’s causing this?
Fertilizer guy was here a couple weeks ago. I tried Citric acid and that didn’t do much at all. I am now going to try ascorbic acid and see if that helps with the stains.
Last resort is trying proteam metal magic.. heard people have had success with that.
Thanks.
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