associated with continued BSF use. In BSF households, BSF treatment resulted in a 95% reduction of E. coli and an 82% reduction in turbidity of untreated source water. Furthermore, BSF-usage in households resulted in a 47% reduction of diarrheal disease as compared to control households that did not have BSFs.
However, a significant proportion of BSFtreated BSF-treated and stored samples became re-contaminated after filtration suggesting the need for additional training and education about safe storage and recontamination. Despite recontamination during storage, the concentration of E. colias coli as well as turbidity were still lower in BSF treated and stored water than in untreated water.
The BSF is a robust water treatment technology for use in rural Cambodian households, capable of effective removal of indicator bacteria, specifically E. coli, and significant reduction of diarrheal disease. BSF performance is comparable to other recommended household water treatment interventions, such as the ceramic water purifier; however BSFs provide the additional advantage of not being prone to breakage or needing replacement parts.
To read the full study: [http://www.wsp.org/sites/wsp.org/files/publications/WSP_biosand_cambodia.pdf Improving Household Drinking Water Quality: Use of BioSand Filters in Cambodia]. Water and Sanitation Program, May 2010.
====Akvo RSR Projects====
The following projects utilize concrete biosand filters.
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{|style="border: 2px solid #e0e0e0; width: 20%; text-align: justify; background-color: #e9f5fd;" cellpadding="2"
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|[[Image:akvorsr logo_lite.png|center|60px|link=http://akvo.org/products/rsr/]]
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|[[Image:project 158.jpg |thumb|center|140px|<font size="2"><center>[http://rsr.akvo.org/project/158/ RSR Project 158]<br>Rainwater harvesting for Nicolas School</center></font>|link=http://rsr.akvo.org/project/158/ ]]
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{| style="width: 70%; text-align: justify; background-color: #f5f5f5;"|[[Image:rsr 158.jpg|thumb|none|200px|<font size="2"br><center>Project 158</center></font>|link=http://rsr.akvo.org/project/158/]]|'''Akvo RSR Project:''' [http://rsr.akvo.org/project/158/ Rainwater harvesting for Nicolas School]The project takes place in a very dry part of Ethiopia. The rainy season is short and the aim is to harvest rainwater for the children at the school to use. 80% of children at the school have parents with disabilities such as loss of arms, legs or eyesight. Water collected will be used to provide water for drinking, washing hands & sanitation. The local water supply is unreliable, and exists in unsanitary conditions. The project will copy an existing successful project at the nearby Kindergarten.|}
===Manuals, videos and links===
