The filter itself isn't reusable—or ready for mass production—and even at a fraction of a cent, it could be too expensive for those who need it most. However, it does have the potential to help deliver potable water in a scalable way.
In the following video you can see how it would work in conjunction with a reusable water bottle.
[youtube]http://www.youtube.com/watch?v=0ydPMl7hOtA&feature=player_embedded
Learn more at iO9 (via Genius Machine).