15-18: Alternative to Bromine Improves Cooling Water Microbial Control andAmmonia in the cooling loop poses an additional challenge for Hypochlorite or oxidizing biocides in controlling the microbiological activity since monochloramines are not effective biocides. Historically Bromine based non oxidizing biocides have been an industry standard with occasional Isothiazolin or Gluteraldhyde dosage. This paper discusses how mixed oxidants, as a combination of hypochlorite and peroxide, generated on site replaced non oxidizing