Laboratory studies actually proved Solar Water Disinfection (SODIS) to be effective at killing pathogens after a few hours of exposure to the sun’s UV rays. The problem appears to be that lab-attained results often are not the same as those out in the field. The method was not disproved, but the results were, as SODIS failed to significantly reduce the number of diarrhea cases among its three million users. Possible explanations include improper storage, use of unclean containers, and contamination from sources other than drinking water.
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