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Brown staining on pool walls and fixtures is usually from a high iron content in the water. The chemical reaction with newly added fill water and the addition of chlorine shortly after will cause a fallout of this metal. I have witnessed this years ago after adding a gallon o f chlor. to a newly filled pool and just watched the brown cloud form and fill the pool to a chocolate brown color.

There are chelating agents to prevent this from happening.

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10y ago

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