Ionization can be an effective process to control Legionella in potable water distribution systems found in health facilities, hotels, nursing homes, and large buildings.
A 2011 study by Lin, Stout and Yu evaluating 79 research papers found copper-silver ionization to be the only Legionella control technology which has been validated through a proposed four-step modality evaluation (need reference or description of "modality" in this context since it does not apply in all situations).