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==Movies==
* How the BioSand Filter Works [http://www.youtube.com/watch?v=hb0xf3mRbJM http://www.youtube.com/watch?v=hb0xf3mRbJM]
* Health and filters [http://www.youtube.com/watch?v=LPAWuws7qMM&feature=related
* Demo [http://www.youtube.com/watch?v=9Cj4yO4nLLY&feature=related www.youtube.com/watch?v=9Cj4yO4nLLY&feature=related ]
* Zambia [http://www.youtube.com/watch?v=f5htXA1OVio&feature=related www.youtube.com/watch?v=f5htXA1OVio&feature=related ]
==Footnotes==
==External Links==
* Organisation [http://www.cawst.org CAWST (- Centre for Affordable Water and Sanitation Technology)]
==References==
