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Water is accepted, almost universally, as an abundant and commonplace material in the life of Man. This same misconception of the importance of water exists, to a slightly smaller degree, in our industrial life. The necessity of guarding and conserving this great natural resource is imperative today, not tomorrow. Man's industrial progress can be traced by studying his utilization and exploitation of the earth's watercourses. Our future industrial progress will, in a large measure, be determined by our rational use of water. Industrial operations entail a demand for water both in quantity and quality. These two requirements vary not only between different types of plants but also for different uses within each plant. A secure water supply must be a basic consideration in the selection of a site for any industrial plant. It is essential that the supply be adequate to serve all the intended uses. The water requirements of a plant may be broadly classified as industrial and sanitary. This Manual is primarily concerned with industrial water, which may be defined as water (including all its impurities) used directly or indirectly in an industrial process. Potable water is that which is intended for immediate or ultimate human consumption; publications of the Public Health Service provide full information about such supplies.