Why ClO₂  > Comparison  > ClO₂ vs. Ozone

ClO₂ vs. Ozone

Does not form bromate, a carcinogen...

Ozone is a stronger disinfectant than ClO₂, but both are able to inactivate cryptosporidium. However, the strong oxidizing potential of ozone also leads to the formation of bromate, a regulated carcinogen in drinking water. In water sources containing bromide, the allowable dose of ozone can be severely limited by the bromate limits. Because of the high reactivity of ozone, a residual is short-lived and difficult to measure. Plus, the capital, operating and maintenance costs for ozone systems are high.

Chlorine dioxide as a pre-treatment avoids the formation of bromates and TTHM compounds. ClO₂ systems are much less expensive to install.

Recent studies have demonstrated that ClO₂ is effective as a pre-treatment before ozonation and significantly reduces the formation of bromates.