Pickering AJ, Crider Y, Sultana S, et al. - Through this double-blind cluster-randomized controlled trial of 100 water points with 920 eligible households, experts assessed the impact of installing novel passive chlorination devices at shared water points on child diarrhea prevalence in low-income, densely populated communities in urban Bangladesh. In comparison with children in the control group, children in the treatment group had less WHO-defined diarrhea. In contrast with 0% at control taps, drinking water at the point of collection at treatment taps had detectable free chlorine residual 83% of the time. For decreasing child diarrhea and for attaining global progress towards Sustainable Development Goal 6.1 to achieve universal access to safe and affordable drinking water, passive chlorination at the point of the collection could be an efficient and scalable strategy in low-income urban settings. Moreover, targeting a low chlorine residual (< 0·5 ppm) in treated water could enhance the taste acceptability of chlorinated drinking water while still decreasing the risk of diarrhea.