Exhibitors demonstrate water treatment experiment at the Japanese stand during a water exhibition of the Fifth World Water Forum in Istanbul of Turkey, on March 18, 2009. A record of 28,000 participants from all over the world are gathering in the forum kicked off Monday in the biggest Turkish city of Istanbul, organized every three years by the World Water Council together with the host country, to promote ideas about conserving, managing and supplying water. [Xinhua]

A visitor walks past the Chinese stand during a water exhibition of the Fifth World Water Forum in Istanbul of Turkey, on March 18, 2009. [Xinhua]