It only takes 6 mils of biofilm thickness to decrease heat transfer by 12%. This means that more power is consumed to achieve the same amount of cooling. Eliminate the biofilm, and cooling towers return to their peak performance. However, once a biofilm has been established, mechanical cleaning cannot remove all traces of it. In fact, mechanically cleaned surfaces are more rapidly colonized than new surfaces. The best solution for a cooling tower that is not operating on a Chlorine Dioxide biocide program is to clean it with a CLO2IX® Portable System and then prevent the recolonization of the biofilm with a permanently installed CLO2IX® system.