Many people in Kenya's sprawling slum of Kibera do not have toilets and often pay to use the few public toilets.

But the toilets are closed at night and slum dwellers sometimes use plastic bags to dispose of their waste, which they dump on garbage skips.

Now biodegradable bags intended to alleviate poor sanitation and convert human waste into fertiliser have been introduced.

Slum dwellers are buying PeePoo, as the bags are called, and the people making them say they will reduce outbreaks of disease.

Catherine Soi reports from Kibera, on the outskirts of the capital Nairobi.