Maybe it is iron. Many municipal and even some well water sources have iron as a contaminant. It can cause rust marks in the bathtub or toilet, and it can stain your swimming pool. What can you do to get iron stains off of your swimming pool walls?
What's That Yellow-Brown Stain On My Swimming Pool Walls?
From Mat Luebbers, About.com GuideAugust 31, 2012
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