Brown indented stains

Klittle

New member
Aug 7, 2023
1
Fort Worth, TX
We live in Fort Worth, TX and we are having an issue with brown stains that some feel like divot creating a small cavity. We have tried rubbing lemon, shocking it, pumice stone. Our pool was built by prior owner we think around the 80's. We had it resurfaced in 2012. Any suggestions removing these stains? Thank you
 
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Have you tried rubbing some crushed up vitamin C in a sock on it or laying a Vit C tablet on the stain?

 
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