DO WATER FILTERS WORK?

NOT NECESSARILY, DESPITE THE $450 MILLION AMERICANS SPEND EACH YEAR TO PURIFY WHAT FLOWS FROM THEIR TAPS

You've read about the outbreaks of waterborne illnesses in places like Milwaukee, Las Vegas, New York City and Washington. You've been concerned that traces of lead may be lurking in your pipes. So just to be on the safe side, you've installed a water filter on your kitchen tap. Trouble is, you may not be any better protected. In fact, the water you drink may be dirtier than it was before.

The U.S. is blessed with one of the best water-supply systems in the world. Yet half of all Americans worry about getting sick from tap water contaminants, according to a...

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