This year a team of engineering students implemented a bio sand water filter at the site and at other schools in the area.  This is the third year of research and implementation of this filtration system and this year the team seems to have come close to perfecting the system itself. The variable that remains is the question of how well and rigorously the filter will be maintained by the locals.  The desire for clean potable water in the area would suggest the necessary incentive.  Particularly when (like this year) the drinking water is brown, what the locals refer to as chocolate water.