what are the limitation of purification of water using sunlight
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The ultraviolet part of sunlight can also kill pathogens in water. The SODIS method uses a combination of UV light and increased temperature (solar thermal) for disinfecting water using only sunlight and PET plastic bottles.
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Just leave a clear glass or plastic bottle out in the sunfor six hours. SODIS, or solar water disinfection, is an age-old method touted by the World Health Organization for areas where access to clean water is limited. UV rays in the sunlight tear apart the microbes to make water safe.
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