to those who make water drinkable.
"Professor Georg Alexander Krause, engineer and inventor, is the first to develop the method of using electrolysis to deposit silver ions in polluted water in order to bacteriologically clean it.
In the 19th century, the Swiss professor of botany, Carl Wilhelm von Nägeli shows for the first time the disinfectant qualities of silver. He uses the expression “oligodynamics” on his discovery. The oligodynamic effect is still used today for the preservation of drinking water Trinkwasser in mobile water containers (on board ships, aircraft, in camping).
The disinfectant effect of silver was known already in antiquity. It was noted that water in silver vessels stayed drinkable longer than water in other vessels."http://www.katadyn.com/
"The Berkeley Lab technology could also substantially lower energy and other operating costs of arsenic removal. This arsenic removal system does not require energy intensive processes like electrodialysis or reverse osmosis. Energy requirements for system operation will be limited to electricity for pumping water into the system, and mixing and transportation of raw and waste materials to and from the site."http://www.lbl.gov/tech-transfer/techs/lbnl1742.html
more about arsenic removal: http://news.bbc.co.uk/2/hi/south_asia/6136970.stm