Our team has designed a novel liquid chlorine doser (the Venturi) that employs properties of fluid dynamics to automatically add liquid chlorine at the point of water collection (e.g. taps), without moving parts or electricity. The Venturi’s ability to precisely dose at tap outflows across varying flow rates enables consistent dosing under the taste detection limit of most users, increasing user acceptability. The use of dilute bleach as the chlorine source enables a large potential target market because dilute bleach is widely available in low-income settings.
The venturi doser was originally designed by Stanford engineers to fit onto shared handpumps, commonly found in low income urban settings. The most recent version of the device was co-designed by MSR Global Health and Stanford University to fit onto shared taps at Kenyan kiosks. The Venturi uses commercially available Waterguard as its liquid chlorine source; bottles can be poured directly into the device when refills are needed. Recently we completed a field test of the chlorinator at kiosks in Kisumu, Kenya in collaboration with SWAP, PATH, and MSR Global Health.