Study subjects: The ID Hospital admitted approximately 23,000 patients with diarrhoea each year for the years 2001 and 2002. We expect that similar number of patients with diarrhoea will be admitted during the study period. We expect about 25 percent of them will be under five children. Based on many clinical trials with hypo-osmolar ORS formulations, we expect that symptomatic hypotraemia will be a rare event.