This half-day class is designed to provide participants with an understanding of the concept of Contact Time (CT) used in providing effective disinfection of water. Beginning with a full explanation of CT, the reasons for use of tables supported by sound science and research will be examined as it relates to water microbiology. A brief explanation of Irradiation Time (IT) will be covered to assist in understanding similar concepts in the use of ultraviolet energy as an effective disinfectant. The various types of chemical disinfectants will be examined, with an explanation of the most successful methods that are used to provide the best methods of pathogen elimination. Lastly, a brief exercise will follow related to the use of CT tables and how to use the tables for compliance with the Safe Drinking Water Act.

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