Effective evaluations of new programs can only be accomplished with monitoring equipment for corrosion, deposits, and bio-mass which simulate system conditions. A baseline performance must be developed on existing programs prior to new program evaluation. Monitoring must be rapid and sufficiently accurate to detect inadequate treatment program performance quickly before serious damage to the plant equipment. Pilot plant on-site cooling tower evaluations are preferable if systems cannot tolerate damage due to inadequate performance of new programs. New programs must be analyzed and compared to system needs to determine whether they should be evaluated. Case histories are given.

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