Abstract

UNTIL recently, the operator of a water treatment plant had to make all control adjustments manually and at various places around the plant. Pumps had to be started and stopped, valves opened and closed, chemical dosages adjusted, and chemical tests performed. Now, the skills of scientists and engineers are changing the picture. Remote controllers start and stop pumps and open and close valves. Pacing devices which operate according to water flow, automatically control chemical feeders. Automatic in-

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