The state government confesses it can no longer supply potable water free of charge, and has introduced monthly fixed charges - but only residents in affluent neighbourhoods, like Victoria Island, Lekki and Ikoyi, pay.

BBC: NEWS | Africa | Lagos: Africa's party capital

"But we feel such innovations will make a difference to our endeavor to supply potable water in our programs, and we would like to see a successful outcome from the research work, " he said.

CNN: Nanotech and 'tea bag' to clean up drinking water