A portion (commonly about half) of the water evaporates in the cooling tower. The remainder can be bled off to prevent concentration of contaminants in the water. Suitable water treatment such as the "Dolphin" system can reduce this bled-off water, but it can't reduce the amount of water evaporated.
Each case should be analyzed economically. Sometimes it will beneficial, sometimes not.
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In vino veritas; in cervisia carmen; in aqua E. coli.
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