Ok - I confirmed my ring around the pool is indeed IRON ... it easily went away with the Vitamin C tablet. Should I just use more tablets to remove the rest of the ring or what?
No, you'll need to buy pounds of ascorbic acid, and let FC drop to nothing. Which means you'll need an algaecide to keep it from blooming, and when it's all done, you'll need a sequestrant. Start reading here: ascorbic-treatment-to-rid-pool-of-metal-stains-t2298.html
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