Copper–silver ionization by CSIDefender® is a facility potable water treatment technology used for Legionella growth control and prevention. These copper-silver ionization units are commonly installed in either large potable hot water distribution networks or point of entry applications. Legionella is a bacterium known to cause Legionnaires’ disease, a preventable form of severe pneumonia. Copper-silver ionization is recognized by the CDC, EPA and WHO. CSIDefender® is also regularly specified by engineering consultants in design stage new construction projects. Copper silver ionization water treatment can also be easily retrofitted into existing facilities such as healthcare, nursing homes, and hotels. C-ETL-UL, CSA, CE and NSF/ANSI61 on all wetted components.