I have a brown spot on pool sidewall that isn't going away. I have ph at 7.2, chlorine at 30 ppm 6 bags of shock, and cya is 50 ppm. Brushing 3 times a day, however spot grows yellow shell after 24 hours. I attach a picture of after I brush, and 24 hours of growth.
- May 3, 2014
- 58,303
- Pool Size
- 6000
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
Welcome to the forum!
Put some Vitamin C tablets in a thin sock and crush them up a bit. Set the sock against the spot for few minutes.
If it clears away the stain, then it is iron. Most likely from a wire tie or rebar too close to the surface of the gunite.
I suggest you read ABC's of Pool Water Chemistry.
Put some Vitamin C tablets in a thin sock and crush them up a bit. Set the sock against the spot for few minutes.
If it clears away the stain, then it is iron. Most likely from a wire tie or rebar too close to the surface of the gunite.
I suggest you read ABC's of Pool Water Chemistry.
Thank you! I'll give that a shot this afternoon. I'll let you know.
I used about 6 500 MG vitamin c tabs and scrubbed the mark until each tab disintegrated for about 8 minutes. Stain is still there and did not change. I'll try again tonight.
- May 3, 2014
- 58,303
- Pool Size
- 6000
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
Great suggestion. The magnet was attracted to the spot. Going to make calls to get it repaired.
- May 3, 2014
- 58,303
- Pool Size
- 6000
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
It is iron.
A repair will not be pretty. So consider what you have versus what it will be if chipped out and pool putty put over it.