In his research for Wirecutter, air- and water-quality writer Tim Heffernan has had his water lab-tested nearly a dozen times, in two homes, by six companies and an independent laboratory. Every result was the same: His water was virtually pristine. So he ditched his filter. And he thinks that, by learning what's in your water, you might be able to do the same. Tim details the three ways of thinking about filtration and suggests an at-home test kit that will tell you exactly what’s in your water here: https://nyti.ms/4l6DXVu