MSR/Stanford Venturi Doser

The MSR/Stanford Venturi Doser is installed directly into the water systems in public kiosks and automatically injects water with a precise dose of chlorine as it produces water for customers. The product uses the venturi effect, which means the product requires no moving parts or electricity. Liquid chlorine fills the chlorine tank which flows into the float tank. Water flows through the device from a larger to a smaller section and sucks an appropriate amount of liquid chlorine to treat the water before being discharged to the customer. The chlorinator uses commercially available Waterguard as its liquid source.

During trials of the prototype technical support was provided by the manufacturer.

10 years

SWAP in partnership with Stanford University conducted a study across 170 water kiosks supplying to 10,000 people living in Bangladesh and Kenya. It was determined that point-of-chlorination reduced contamination of fecal indicator bacteria in drinking water by 70% and reduced child diarrhea in children by 23% (95% CI 9-35%; N=4227).

The World Health Organisation (WHO) states free residual chlorine post chlorine dosing should not exceed 5 mg/L if it is to be considered for lifetime use.