Challenge Brief OpenIDEO has partnered with Unilever and WSUP (Water and Sanitation for the Urban Poor) to explore sanitation issues in Ghana. Together we’re asking you, the OpenIDEO community, to help us come up with sustainable sanitation inspirations and concepts. We'll be focusing on low-income urban areas like Kumasi – the nation’s second-largest city, with a population of more than 1.5 milli