Solar water disinfection (SODIS) involves exposing water-filled plastic polyethylene terephthalate (PET) bottles to sunlight for several hours. Exposure times vary depending on weather and climate from a minimum of six hours to two days during fully overcast conditions. It is recommended by the World Health Organization as a viable method for household water treatment and safe storage. Over two million people in developing countries use this method for their daily drinking water. COUNT 4
QSN1 Solar water disinfection is recommended by which organization? ANS1 the World Health Organization QSN2 How long should the plastic bottles filled with water be exposed to sunlight during Solar water disinfection? ANS2 a minimum of six hours to two days during fully overcast conditions QSN3 What does the World Health Organization say about Solar water disinfection? ANS3 a viable method for household water treatment and safe storage QSN4 How many people use Solar water disinfection to disinfect their drinking water? ANS4 Over two million people in developing countries