Class B Drinking Water Practice Test, Categorized

Class B Drinking Water Practice Test, Categorized. Corrosion Control _____ of 11 questions. 1. Aluminum, zinc, and magnesium are often used as anodes to prevent corrosion to other metals. ... 6.The operator of the ion exchange water treatment plant notices that one of the ion exchange units has a finished water hardness of one grain. What ... ................
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