The effective use of both oxidizing and non-oxidizing biocides for control of MIC in cooling water systems was evaluated. A patented localized corrosion monitor was used to monitor changes in localized corrosion rates within laboratory scale and pilot cooling tower systems under various biocide treatment regimes. Under many of these conditions the changes in localized corrosion rates can be directly correlated with specific biocide feed. In particular, bromine based biocides exhibited the
greatest control of MIC and corresponding recovery in localized corrosion rates.