Changes

UV Waterworks systems have been used in India, South Africa, the Philippines, Honduras, and other countries. Since 1998, the Mexican government has installed about 100 in Guererro, a state on the Pacific in southwestern Mexico. The results have been very positive. In the summer of 2000, Gadgil reports, people from Water Health International returned with stories and data showing a dramatic decline in the incidence of diarrhea among children and adults. And preventing deaths and illness are just the most visible effects of purifying water—it also protects children from stunted physical and mental growth. "This is the kind of story that really makes my day, really makes me happy," Gadgil continues. "It makes me feel good when I get up in the morning."

==Acknowledgements==

* [http://www.who.int/water_sanitation_health/dwq/wsh0207/en/ Managing Water in the Home: Accelerated Health Gains from Improved Water Supply]. WHO, 2002.

* [http://web.mit.edu/invent/www/ima/gadgil_bio.html Courage: Ashok Gadgil.] From the book: Inventing Modern America: From the Microwave to the Mouse. David E. Brown. MIT Press.