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Background In October 2010, Haiti was struck by a large-scale cholera epidemic.
Diarrhea and acute respiratory infections account for nearly 30% of deaths among children displaced by humanitarian emergencies.
The devastating earthquake of 2005 severely damaged over 4000 water and sanitation schemes in northern Pakistan.
Following the Asian tsunami of 26 December 2004, the vital domestic fresh-water wells in the coastal zone were either scoured out of
Batch water treatment consists of the intermittent use of settling tanks for water clarification, and is a common treatment practice