Financially sustainable strategies are needed to increase access to safe drinking water in low-income settings. We designed a novel in-line chlorine doser that employs the Venturi principle to automatically add liquid chlorine at the point of water collection (tap outflows). The Venturi does not require electricity or moving parts, and users do not have to change the way they typically collect water. We field-tested the Venturi and assessed its technical performance and sales viability at water kiosks in Kisumu County, Kenya. We offered kiosk owners 6-month service packages to lease or lease-to-own the device; 27% of kiosks given a sales pitch committed to a service package. All but one kiosk paid in full during the 6-month service period and more than two-thirds purchased the device with payments totaling >$250 USD per kiosk. Kiosk customers could choose to purchase chlorinated or unchlorinated water from separate taps; 66% reported buying chlorinated water. Kiosk taps fitted with the Venturi had detectable free chlorine residual 97.6% of the time. The technical performance of the Venturi and effective demand from kiosks indicate high potential for the Venturi to increase safe water access in low-income communities.

需要经济上可持续的战略来增加低收入环境中获得安全饮用水的机会。我们设计了一种新颖的在线氯计量器，它采用文丘里管原理自动在集水点（自来水流出）处添加液氯。文丘里管不需要电力或活动部件，用户无需改变通常的取水方式。我们对文丘里管进行了现场测试，并评估了其在肯尼亚基苏木县售水亭的技术性能和销售可行性。我们向信息亭所有者提供了为期6个月的服务包，以出租或租赁该设备；有27％的信息亭指定了销售服务套餐。在6个月的服务期内，除一个自助服务亭外，所有自助服务亭均已全额付款，超过三分之二的用户购买了该设备，每个自助服务亭的付款总额超过250美元。自助服务终端用户可以选择从单独的水龙头购买氯化水或非氯化水；66％的人报告购买了氯化水。装有文丘里管的自助服务水龙头有97.6％的时间可检测到游离氯残留。文丘里管的技术性能和售货亭的有效需求表明，文丘里管在增加低收入社区的安全用水方面具有很大的潜力。