Legionella Testing & Risk Assessment

How to Minimize Legionella
The Cooling Technology Institute (CTI) has published a guideline, Best Practices for Control of Legionella, which provides details on Legionnaires’ disease, legionella bacteria, and methods for preventing contamination of cooling water systems.


The paper describes the conditions that promote legionella growth and then explains monitoring and testing procedures. Routine treatment and routine on-line disinfection are covered, followed by a step-by-step procedure for emergency disinfection. Recordkeeping is then touched on.


In summary, the CTI says that to minimize the proliferation of legionella, its consensus recommendations are:

  • Minimize water stagnation
  • Minimize process leaks into the cooling system that provide nutrients for bacteria
  • Maintain overall system cleanliness to minimize buildup of sediments that can harbor or provide nutri- ents for bacteria and other organisms
  • Apply scale and corrosion inhibitors as needed
  • Use high-efficiency mist eliminators on cooling towers
  • Control the overall microbiological population.


The complete paper is available at www.cti.org.

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