In the case of E. coli,
Ag(5) showed bacteriostatic (99.45% killing) and bactericidal
effects (99.92% killing) in 60 and 90 minutes respectively, while
Ag(7) and Ag(10) displayed almost similar bactericidal efficacy
and both took almost double the time, i.e. 180 minutes to
achieve $99.9% bacterial reduction