Solar water disinfection (SODIS) relies on the freely available ultraviolet and infrared rays of the sun, which can disinfect by killing pathogens that contaminate water. The process is as easy as leaving a clear plastic bottle of water out in the sun for six hours.
If clean water is that easy, why are so many people, especially young children, dying from diseases contracted by drinking unclean water? There is a major obstacle to effective use of SODIS: if the water is muddy or murky, pathogens can hide in the shadows of the particulates, avoiding the death-rays of the sun. Read more
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