New water purity sensor offers a breakthrough for solar disinfection

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The solar water disinfection method, or SODIS, sounds little too good to be true: simply fill clean plastic bottles with water, then leave them in the sunlight for six to twelve hours and the UV-A rays will kill viruses, bacteria and parasites. The problem, however, is how to ensure the purification process is complete, and this uncertainty has greatly affected the adoption of the SODIS method worldwide.

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