Quantitative ATPMetry measures all living microorganisms, bacteria, molds, viruses, etc. present in the water. Legionella is a tiny part of this measure.
NewIonic also protects against PYO and nosocomial diseases that could use the biofilm to grow.
Monitoring a selection of end points twice a year ensures that biofilm removal is quantifiable, even with a single-pass treatment on main entry point of the water network.