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{{Language-box|english_link= Charcoal filter / Activated carbon | french_link= Coming soon | spanish_link= Coming soon | hindi_link= Coming soon | malayalam_link= Coming soon | tamil_link= Coming soon | swahili_link=coming soon | korean_link= Coming soon | chinese_link=木炭过滤器/活性炭 | indonesian_link= Coming soon | japanese_link= Coming soon }}
[[Image:Ceramic_filter_icon.png|right|80px]]
[[Image:charcoal filter.jpg|thumb|right|200px|The Unicef upflow charcoal filter. <br>Photo: WHO.]]
[[Image:activated carbon filter.jpg|thumb|right|200px|Carbon Adsorption Diagram. Credit: [http://www.filtersfast.com/articles/Guide-to-Water-Purification.php filternfast.com]]]
'''Charcoal''' can be quite effective at removing some tastes, odours, and colour. Ordinary charcoal available locally could be used, but activated carbon is more effective. An example of such a filter is the UNICEF upflow sand filter. However, if the charcoal is not regularly renewed or if the filter is left unused for some time, there is evidence that it can become the breeding ground for harmful bacteria.
===Acknowledgements===
* [http://docs.watsan.net/Downloaded_Files/PDF/Kayaga-2005-Emergency.pdf Emergency treatment of drinking water at point-of-use] or ([httphttps://www.who.int/water_sanitation_health/hygienepublications/envsan/tn05tech_note5/en/index.html alternative link]). WHO.
* [http://www.filtersfast.com/articles/Guide-to-Water-Purification.php A Simple Guide to Water Filtration.] Filtersfast.com
* Chan, Louis; Chan, Marcus; Wang, Jingwen. [http://www.mie.utoronto.ca/undergrad/thesis-catalog/files/12.pdf Design of Water Filter for Third World Countries.] March 26th, 2009.
* Misihairabgwia, Jane, Ntulia, Victor, et al. [http://bscwwww.iheresearchgate.nlnet/pubpublication/nj_bscw.cgi/d2607370/Misihairabgwi.pdf 264872660_Application_of_locally_produced_activated_carbons_in_water_treatment Application of locally produced activated carbons in water treatment.] Department of Biochemistry, University of Zimbabwe.
* [http://www.merid.org/~/media/Files/Projects/nano-waterworkshop/watertechpaper-NoGraphics.ashx Overview and comparison of conventional water treatment technologies with nano-based treatment technologies.] Meridian Institute’s Global Dialogue on Nanotechnology and the Poor: Opportunities and Risks (GDNP).
