American volunteer Derek E. Chitwood, right, helps other volunteers to install water filters in quake-hit Lushan County, Sichuan Province on Wednesday, May 2, 2013. As part of Chiwood's plan, 1000 ceramic water filters will be distributed to local villagers free of charge. Chitwood, who holds a doctoral degree in environmental engineering, first came to China in 1988. He now lives in the city of Kunming in southwest China's Yunnan Province with his family. Photos: CFP
American volunteer Derek E. Chitwood, together with other volunteers, unloads ceramic water filters from a vehicle in quake-hit Lushan county of Southwest China's Sichuan province on Wednesday, May 2, 2013.