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[[Image:Biosandfilter.png|right|80px]]
[[Image:concrete biosand filter.jpg|thumb|right|200px| Bio Sand Filter in Kumbo, Cameroon. Photo: [http://www.lwdgc-africa.org/15.html LWDG Cameroon.]]]
====Suppliers====
Free mold designs are available from CAWST. A Wood Mold instruction manual is available from the OHORIZONS Foundation.
===Costs===
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 project(s) utilize concrete biosand filters.
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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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===Manuals, videos and links===
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|{{#ev:youtube|f5htXA1OVio|200|auto|<center>BioSand water purification <br>filter in Lusaka, Zambia</center>}}
|{{#ev:youtube|zI7vQP18nZo|200|auto|<center>Interview with Biosand Filter<br> (BSF) local entrepreneur <br>Mr. Narayan Pandey}}
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===References===
This article is based on a factsheet from [http://www.cawst.org/ Centre for Affordable Water and Sanitation Technology (CAWST)], which is gratefully acknowledged.
* <cite id=Buzunis95>Buzunis, B. (1995). [httphttps://wwwarchive.manzwaterinfo.caorg/stream/documentsbiosand_Intermittently_Opperated_Slow_Sand_Filter_Thesis/Byron%20Buzunis%20-%20Intermittently%20Opperated%20Slow%20Sand%20Filter%20ThesisIntermittently_Opperated_Slow_Sand_Filter_Thesis_djvu.pdf txt Intermittently Operated Slow Sand Filtration: A New Water Treatment Process]. Department of Civil Engineering, University of Calgary, Canada.</cite>
* <cite id=Baumgartner06>Baumgartner, J. (2006). [http://iopscience.iop.org/1748-9326/2/2/024003/pdf/erl7_2_024003.pdf The Effect of User Behavior on the Performance of Two Household Water Filtration Systems]. Masters of Science thesis. Department of Population and International Health, Harvard School of Public Health. Boston, Massachusetts, USA.</cite>