These filters are made with local clay and sawdust. Why sawdust? In order to kill any pathogens in the water, it has to flow through the ceramic filter at within a specific range of flow. In order to create that, sawdust is mixed with the clay, and when it is pressed into shape, it is fired in a kiln (which you can see in the background of the first photo). The sawdust burns off and leaves pore spaces big enough to hold water long enough for it to be in contact with the colloidal silver the filters are painted with, just long enough for the contact to kill the pathogens. The correct "recipe" of sawdust/clay is unique to each area and clay type.
Michelle and Brendan helped to paint some of the filters we used.
We invited families to participate in the project. Half would receive filters in August of '07, half would receive them in May of '08. Forty women showed up initially, but by the time we left eighty had come and signed up.
Michelle and another surveyor delivering filters.
Michelle never missed a puppy...
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