Cooling Tower corrosion inhibitors with Phosphates, Ortho phosphates, phosphonates, Zinc, Zinc- phosphonates, Molybdenum, Polymeric inhibitors, Tracer modified detectable corrosion inhibitors are used depend on make water, TSE make up, Cycles of concentration, blowdown systems, cleaning cycles, proximity to marine environment, Side stream filter configuration, material of construction in the circuit, process plant emissions, hardness and dissolved solids of the make up water and client requirements.