The challenge
As with any large, complex water system, the challenges of legionella control and maintaining a high level of system hygiene are abundant. With numerous cold water storage tanks (CWST), calorifiers, multiple outlets and hidden pipe networks, coupled with very little down time, this system required a combined chemical and mechanical solution. The normal method for sanitizing hot water, was to ensure that the water temperature was maintained at 62 °C, which presented a scald risk and was cost-ineffective.