According to the UN, more than 5 million children die every year of sanitation-related diseases such as diarrhoea because of a lack of basic sanitation facilities.
Between August and October this year, ten volunteers with Platform2, an overseas youth programme run by Christian Aid, helped build a new toilet block for a Peruvian nursery school, transforming the health prospects for pupils, present and future.
To mark World Toilet Day (19 Nov) we compiled this photo gallery.
The pupils at the nursery school in the Peruvian shanty town of Pachacutec had no access to hygenic sanitation. All photos: Platform2/Farzaan Patel