The Challenge: A state university uses cooling water to operate three centrifugal chillers and thereby supply their facilities with 1,600-tons of cooling capacity. The system’s four-celled, 6,000 gallon cooling tower supports a recirculation rate of 4,800 gpm. A chemical maintenance program with sulfuric acid for pH control treated the cooling water. However even with chemical treatment, control of scale, fouling, and micro-bio

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