Excerpts from the book "How Design Changed America" by Henry Keck
Under the leadership of Warren Haussler, President of Keck-Craig, and Roy Fujitaki, a mechanical engineer with 20 years of experience at our firm, we proceeded with the work. One of first tasks was to find a suitable source of ultraviolet radiation. Strangely enough there were no manufacturers in the United States of the appropriate tube lights. My assumption is that U.S. manufacturers were afraid of the liability based upon these products since the human eye can be severely injured by looking at ultraviolet light.
We finally found a source of the appropriate light in the form of a tube which we incorporated in a long shallow housing. The molded enclosure was made of a very tough weather resistant plastic. Inside we placed a bright, inexpensive aluminum reflector.
The concept was to run a shallow stream of water through the trough at the bottom of the housing that would be irradiated by the tube lights above. We made an exact working prototype and the concept worked pleasing our scientist originator and ourselves since the whole assembly could be made on a production basis and sold for $500.00. It would thus be affordable for small villages and could handle the pure water needs of a village of 200 persons.