Dr. Jamsheed, the Naray district health director, demonstrates how to install and use a water filter during a class April 8 at Forward Operating Base Bostick. Sixty local national men who work on FOB Bostick sat through the class before receiving filters to take home to their communities. The filters were provided by a nonprofit organization called Waves for Water. If maintained properly, one $50 filter can supply a village of 200 people with clean drinking water for up to five years.