The Green Guide has published a cost comparison chart detailing the annual cost for operating various water filters such as the Pur and Brita filters. The companies manufacturing these water filters make the majority of their profits on repeated purchases of replaceable filter elements, of course, so the annual cost of operating such water filters is far more important than the up-front cost of buying them.
So what’s the verdict? The Brita pitcher is the least expensive water filter on this chart, with an annual cost of $27. It’s a gravity-fed filter, however, so it’s a slow filtering process. It also requires the use of a separate container that takes up additional counter space. That’s why my favorite filter is the faucet-mounted PUR water filter, which runs $96 annually. Check the chart yourself to see others.