I have just read all the ...

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I have just read all the answers posted here very quickly. I presume TwinOxide is an oxidizing biocide and I presume that it is chlorine dioxide. Let me first state that chlorine dioxide is not chlorine and the mode of action is by oxidation. 

Chlorine Dioxide has a very high efficacy of oxidizing the legionella bacterium. 

Legionella proliferates in water with temperatures between 35 degrees celsius to 55 degrees celsius. Legionella can survive temperatures as high as 80 degrees celsius in some cases. 

The easiest and cost effective way to treat legionella is by constant dosing of chlorine dioxide into the cooling tower. This can be carried out using an on site chlorine dioxide generator.