Demonstrating Biosand filters

A majority of the population in the developing world still does not have access to clean drinkable water. Building inexpensive biosand filters with readily available materials, is one way in which villagers in Pakistan are addressing the problem. This video provides a clear explanation and demonstration of an inexpensive 'Biosand' water filter for public standposts.

The YouTube URL is: http://www.youtube.com/watch?v=aLKwH68LjnM.