Long pipe runs and collection tanks where water may stagnate should be avoided. Design Recommendations for Cooling Towers Designing in small ozonization units. Designing in, or replacement with, dry convective heat exchangers. Air intakes should be located at least 100 meters from cooling towers to minimize entry of cooling tower drift into the air inlets. Design evaporative cooling systems such that the failure of of the heat exchanger will not result in the mixing of the wet system with the supply air.
Chlorine is an effective treatment, however, because it destroys the food supply of Legionella.
Care must be used in the selection of biocides and they must be used consistently and in appropriate quantities. Refer to the various references on water treament for more information. Additional information on water treatment may be obtained from Tower San Systems . Complying With the Code of Practice on Legionella, G.Brundett, Power Engineering Journal, Dec. 1994. Position Paper on Legionellosis, 1995.