Certainly—thousands of installations for hundreds of customers demonstrate this. If we didn't think so, we simply wouldn't use it. It has been used in water treatment for decades. A constant ozone concentration of 20—30 ppb efficiently and continuously prevents any germ growth, particularly in the PW tanks which are microbiologically critical without ozone. The ozone is reliably removed by UV until it is below detectable levels before the water reaches the loop on the way to the point of use. The entire loop system is periodically and automatically sanitized with ozone.