Brazed plate heat exchangers perform in many capacities, in this case study they were being utilized to cool flue gas. Brazed plate heat exchangers transfer energy with high efficiency and minimal thermal loss. When operating in environments where poor water quality occurs, or with high temperatures, scale deposits from minerals within the water source may fall out of suspension and adhere to the heat transfer surface, creating an insulating barrier. This may have a detrimental impact on the heat exchanger’s performance and efficiency. In addition to efficiency loss, continued scale build can act as a breeding ground for particulate fouling which can result in corrosion issues.The facility realized efficiencies had fallen far below expected levels and recognized a cleaning was needed.