Potable water must be provided for drinking and culinary purposes on vessels operated in interstate traffic. In ports of the United States and its possessions, potable water may be obtained only from water supplies and at watering points approved by the Sur¬ geon General of the Public Health Service. If the water is treated aboard, the methods used must be approved by the Surgeon General. Many vessels sailing to foreign ports, particularly those carrying a large number of passengers, do not have sufficient potablewater tank capacity or distilling units to meet the demands, and water from foreign ports is taken on board. These supplies are usually of a satisfactory bacteriological quality, but they may require a second disinfection. The Ameriean President Lines has been interested in the use of the ultraviolet process for disinfecting water on its ships which cruise around the world. In Febru¬ ary 1961, experimental testing of an ultraviolet process was started on the SS President Polk and continued during six around-the-world cruises. In December 1961, Dr. Rodney Yoell (deceased), chief surgeon of the Ameriean President Lines, requested the Surgeon General to evaluate the process under actual operating conditions. One of the authors of the following paper, C. B. Huff, performed engineering and bacteriological tests aboard the President Polk when she sailed from San Francisco via Asian and European ports to New
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