We need the rest of the story. Is that black spot the only one in the pool? What is the history of the pool? Where is it located in the pool? Can we get a wider pic showing where the spot is? What size is the spot?
What is your water chemistry? What test kit do you use? How do you chlorinate your pool? What chemicals do you use in your pool?
The stained pool is beyond embarrassing. Our in-depth Guide to remove stains in your pool will help you to remove the stains and prevent them in the future.
Thank you for the reply! I will create a signature, read the article you suggested, and create more detailed posts. I appreciate all the information on this site.
The only thing you can really do is to cut out the area and the metal and fill it back in with new plaster. It might eventually bleed through again if the metal is near the surface.
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