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== External links ==
 
== External links ==
 
* [http://www.raintree-foundation.org/AT/Appropirate_Technologies/Bio_Sand_Filter.html Biosand Filter]
 
* [http://www.raintree-foundation.org/AT/Appropirate_Technologies/Bio_Sand_Filter.html Biosand Filter]
** Clean Drinking Water
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* [http://www.allfilters.com/waterfilter Water Filter FAQs]
** Easy to Use
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** Self contained Maintenance
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** For Everybody
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** No Following Costs
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** Reliable
      
[[Category:Water_treatment]]  
 
[[Category:Water_treatment]]  
 
[[Category:Filters]]
 
[[Category:Filters]]
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