Inactivation of a suspension of fecal bacteria (Escherichia coli ATCC11775) kept in sunlight in custom-made 1-liter solar disinfection bottles, inoculated with E. coli after being filled with either pre-sterilized distilled water or pre-sterilized surface water from talabs at Tulesar Purohitan/Tulesar Charnan. Data are based on standard aerobic plate counts obtained on nutrient agar after 24 hours incubation at 37°C (the experiment was performed on 11 April 2004 at an average irradiance of 680 W m -2 ).