I just returned from a ten day trip to Palawan
for several tribal villages living in the foothills of southern Palawan. There I am helping Wilson wash sand.
The filters were made in Puerto Princesa, Palawan by the Palawan Conservation Corp. Here's a couple of the guys showing me the form they use to make them.
I have also put up several pictures on a web album that you can see at http://picasaweb.google.com/wmodavis/BioSandFiltersInPalawanPhilippines
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