Interestingly, above world map and legend show "No data" for Bangladesh, while in 2002 the WHO named Bangladesh as "The largest mass poisoning [by Arsenic] of a population in history" ... http://www.who.int/features/archives/feature206/en/ Most of above mentioned As removal technologies are too expensive and too high-tech for rural Bangladesh. SORAS (Solar Oxidation and Removal of Arsenic by Wegelin et al.; http://wedc.lboro.ac.uk/resources/conference/26/wegelin-soras.pdf) as also mentioned at the end of above post under "5. Some other ​alternative ​methods", at one time appeared as a promising solution for As removal in developing countries such as Bangladesh. However, I don't know, if it ever became a break-through method like SODIS (Solar Disinfection of Water; www.sodis.ch) did.

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Interestingly, above world map and legend show "No data" for Bangladesh, while in 2002 the WHO named Bangladesh as "The largest mass poisoning [by Arsenic] of a population in history" ... http://www.who.int/features/archives/feature206/en/

Most of above mentioned As removal technologies are too expensive and too high-tech for rural Bangladesh.

SORAS (Solar Oxidation and Removal of Arsenic by Wegelin et al.; http://wedc.lboro.ac.uk/resources/conference/26/wegelin-soras.pdf) as also mentioned at the end of above post under "5. Some other ​alternative ​methods", at one time appeared as a promising solution for As removal in developing countries such as Bangladesh. However, I don't know, if it ever became a break-through method like SODIS (Solar Disinfection of Water; www.sodis.ch) did.