Objective: Cooling towers are heat exchangers which are utilized in specific industrial devices. They possess the potential
to support Legionella bacteria. The objective was to evaluate the efficacy of biocide impregnated polymer against regular
polypropylene polymer in terms of anti-Legionella features during a 120-day period.
Materials and Methods: To reduce the bacterial colonization in towers, anti-Legionella splash fill and regular polypropylene
splash fill material were tested to compare anti-Legionella activity and biofilm formation potential within a 120-day period
using a lab-scale recirculating cooling tower model system. The system was experimentally infected with Legionella
suspension and operated continuously for 120 days.
Results: Legionella colonization occurred on both test material surfaces beginning at the first month. Legionella counts on
surfaces were increased over time on standard polypropylene surfaces. The product with anti-Legionella activity showed
significantly lower Legionella colonization in comparison to standard polypropylene fill.
Conclusion: The product with anti-Legionella activity has a significant biocidal effect against surface-associated Legionella
under the above-mentioned conditions which mimics cooling tower water systems. Product seems to facilitate effective
control program criteria against Legionella colonization in cooling towers.