Filter Plans

Production Manual – Download PDF

Factory Startup Manual – Download PDF

IRC Feasibility Study – Sudan – Download Word Doc

Our Filter

Cross-section drawing of a receptacle and water filter, Manny Hernandez.
Cross-section drawing of a receptacle and water filter, Manny Hernandez.

Our filter consists of a ceramic vessel constructed from a site-specific blend of local clays and a friable material such as sawdust or rice husks. As the filter is fired to 900C the friable material burns out leaving micro-pores which filter out any particulate matter in the water. After firing, the filter is impregnated with silver nanoparticles which act as an anti-microbial agent. The filter is housed in a five-gallon bucket fitted with a spigot preventing recontamination of the clean water. Filters are supplied with simple cleaning instructions have an active life of 24 months or more (depending on water quality).

Testing conducted by MIT, Tulane, Cambridge, Texas A&M, University of Pittsburgh, University of Colorado, and U. of North Carolina has proven the filters to be 98% to 99.9% effective in eliminating water-borne bacteria. The final assembly provides water at a rate between 1.5 to 3 liters an hour at a cost of roughly $21US. Amortized over two years this works out to clean water at a cost of 1/100th of a cent per liter.

Filters can be produced by local potters virtually anywhere in the world using commonly available materials. PWAG collaborates with local NGOs, private organizations, and government organizations to monitor the facilities on an ongoing basis.





Fixing water one drop at a time.