All Depends-Relative: No way to answer remotely. Likely most of what you see in the water, especially sediment once water has evaporated, is caco3, see: https://en.Wikipedia.Org/wiki/calcium_carbonate (dissolved limestone), not chlorine, see: https://en.Wikipedia.Org/wiki/water_chlorination ; other minerals/solutes. Low dose cl to kill bacteria is typically healthier than not, but h2o analysis required to better know.
Answered 7/27/2015
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