A Ugandan chemist has found a way to use old cattle bones and food waste to make clean water. Timothy Kayondo turns the rubbish into activated carbon, which he uses to produce water purifiers. They’re being used in schools and hospitals. It is estimated that one in 10 people on the planet do not have a basic level of access to clean water. In this programme we find out about Timothy’s work and discover more ways people around the world are getting access to safe drinking water. Presenter: Jo Mathys Reporters: Mercy Juma, Celestina Olulode and Tom Colls Producers: Daniel Gordon and Tom Colls Image: Timothy Kayondo