Three tests:
1. Put some cal hypo powder on a stained area. (Cal hypo is usually available as bagged shock. You can probably buy a single bag at a pool store.)
2. Put a few Vitamin C tablets (ascorbic acid) on a stained area.
3. Put a few tablespoons of Iron Out (sodium hydrosulfite + sodium metabisulfite) on a stained area.
See what the results are.
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