The most effective way is to use TwinOxide as the disinfectant, it will be effective between ph 4-11 it will remove All bio film and therefore eliminate the possibility to grow Legionella, besides all this it will also kill active Legionella. All this is done in the most simple way of just dosing 99% pure CLO2 made by Twinoxide
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by Jan Verwater, International Sales Manager at Prime Solutions
Most of the resources for removal and control of legionella can be find here https://www.awt.org/legionella/index.cfm, contains all kind of discussion , guidelines and technologies for removal of legionella. Hope this will help.
We have just installed a UV system to remove legionella in a site that already were some people infected and a couple die...let me know if you need our support.
The easiest way is to install an ozonator circuit and ozonate the cooling water for periods when the bacteria becomes a problem. The effective ozone will kill the bacteria and the ozone is quickly removed from the water which does not require any other action from you as with other chemicals. You obviously need to filter the dead bacteria from the water which might require a bypass filter for this purpose.