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==The Results==
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Overall, studies have shown that the Bio Sand Filter removes:
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* > 97% of E. coli - an indicator of fecal contamination (Duke, 2006; Stauber, 2006)
* > 99% of protozoa and helminths (Palmateer, 1999)
* 80-90% of viruses (Stauber, 2005)
* 50-90% of organic and inorganic toxicants (Palmateer, 1999)
* 90-95% of iron (Ngai, 2007)
* Most suspended sediments


Based on slow sand filter research, the bio sand filter may also remove some heavy metals (Muhammad, 1997; Collins, 1998).
== External links ==
* [http://www.raintree-foundation.org/AT/Appropirate_Technologies/Bio_Sand_Filter.html Biosand Filter]
* [http://www.wcponline.com/pdf/October2012Kearns.pdf] Sustainable Decentralized Water Treatment for Rural
and Developing Communities Using Locally Generated Biochar Adsorbents (879kb pdf)
 


There is also a design modification known as the KanchanTM Arsenic Filter that is effective in removing both pathogens and 85-90% of arsenic from source water (Ngai, 2007).


==Links==
* [http://www.raintree-foundation.org/AT/Appropirate_Technologies/Bio_Sand_Filter.html Biosand Filter]
** Clean Drinking Water
** Easy to Use
** Self contained Maintenance
** For Everybody
** No Following Costs
** Reliable


[[Category:Water_treatment]]  
[[Category:Water filtration]]  
[[Category:Filters]]
[[Category:Filters]]

Revision as of 11:38, 9 November 2012

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External links

and Developing Communities Using Locally Generated Biochar Adsorbents (879kb pdf)

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