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Kanchan Arsenic Filter

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[[Image:CAWST_Kachan.png|thumb|right|250px300px| Cross-section through a Kachan Arsenic Filter]]
The Kanchan Arsenic Filter (KAF) is an adaptation of the biosand filter (BSF). It is based on slow sand filtration and iron hydroxide adsorption principles. The KAF has been designed to remove arsenic from drinking water, in addition to providing microbiological water treatment. Arsenic removal is achieved by incorporating a layer of non-galvanized nails in the diffuser basin of the filter.
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