Clean water is an issue in many overcrowded cities, where contamination by bacteria can lead to high rates of diarrhoea, harming children’s growth and health. In Dhaka, the challenge was finding a water treatment technology that could work without electricity and operate in Dhaka’s extreme weather.

Learn more about the World Bank project in the slums of Bangladesh’s capital city, using water chlorination and changing the way people get clean water.

Photo credit: Zoriah via / CC BY-NC