I have done the Vitamin C test. Crushed vitamin C tablets in a sock and placed it on top of the stain. No luck. Then I bought actual Stain Free Ascorbic Acid and placed a cup in a sock and had it over one stain for 30 min. no luck. It was one Bobby pin that moved around the bottom of the pool and left multiple little stains. I have a 25,000 gallon, pebble plaster pool using BBB method. What do I actually do? I have the pool at 7.2 pH and 0 FC. I'm ready to do the Ascorbic treatment and I know the Bobby pin was metal account I pulled out the min and it was rusted. The stains have been there about a month and a half I'd bet.
Does it take hard scrubbing to get the stains removed?
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Sorry for the bad pic, but it's very windy right now.