 
 <prompt> How long you need make bottles dey sit for sun to kill germs? <response>: Solar water disinfection (SODIS) involve to expose water wey full plastic polyethylene terephthalate (PET) bottles to sunlight for some hours. Exposure times fit dey different based on weather and climate from six hours reach two days during fully overcast conditions. World Health Organization recommend am as one good method for household water treatment and safe storage. Over two million people for developing countries dey use dis method for their daily drinking water. 