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They’ve scrubbed orange streaks off sinks, tossed out stained Fluoride Filtration T-shirts, and wondered why the tap swings from metallic to bitter after a summer hydrant flush. City water isn’t immune to nuisance contaminants—fluoride management included—and homeowners often learn that the hard way. Consider the Esparza-Matsumoto household in Cedar Park, Texas. Devin Esparza (39), a semiconductor equipment engine