Brown spots on bottom of pool and along water line

Kkeebler7

New member
Jul 30, 2020
4
Raleigh, NC
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?
 

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If you can get a vitamin C tablet, try holding it against one of the spots in the water for a few seconds and see if that helps lift it.

Have you fertilized the lawn recently, by chance?
 
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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