Figure 10: Changes in populations of Escherichia coli and viruses () in treated water relative to the initial populations () as a function of specific energy release (J cm−3) during the treatment. Potable water with a conductivity μS cm−1 was used. Hz. The initial () concentration of E. coli was ≈106 colony-forming units mL−1 and that of coliphages ≈107 plaque-forming units mL−1. (1) E. coli; (2) coliphages.