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A review of the progress that has been made in improving the quality of high-purity water during the 40 plus years of existence of ASTM Committee D-19 on Water shows that the steps downward in impurity levels are impressive but the goal of zero impurities is still a long way off. We have reached the limits of the use of electrical conductivity as the sole monitor of further improvement in industrial water quality. If still lower impurity levels are sought, their precise nature must be elucidated, and they must be monitored as specific entities.
high-purity industrial water, water specifications, water quality, electrical conductivity of water, industrial water monitoring, power plants, instrumentation
President, Puricons, Inc., Berwyn, Pa.