Solar water disinfection method (SODIS) kills most pathogens that cause diarrhea by leaving the water in transparent plastic bottle in the sun for six hours. However, such method does not work on those microorganisms hiding under the clay and avoid the UV. This makes murky water more dangerous to drink, especially in developing countries where people fetch water from rivers, streams and boreholes.
Joshua Pearce and Britney Dawney of Queen’s University in Ontario discovered using simple table salt (sodium chloride) can carry out flocculation process that settle out clay and make muddy water clear enough for SODIS treatment. The newly discovered method is published in June issue of Journal of Water.