Which of the following is NOT a common water disinfectant?

Hydrogen peroxide is not typically classified as a common water disinfectant compared to the other options listed. Chlorine, ozone, and chlorine dioxide are widely used in water treatment processes due to their effectiveness in killing bacteria, viruses, and other pathogens.

Chlorine is a traditional disinfectant, often used due to its cost-effectiveness and ability to provide a residual effect in water systems. Ozone is known for its strong oxidizing properties, making it highly effective in disinfecting water but is less common due to its relatively short half-life and instability. Chlorine dioxide is an effective chlorine alternative that acts as a strong disinfectant, particularly useful in treating drinking water and reducing taste and odor issues.

Hydrogen peroxide, while it does possess disinfecting properties, is less commonly employed as a primary water disinfectant primarily due to the challenges related to its stability and the need for special handling and application methods in large-scale water treatment settings. Consequently, it does not enjoy the same level of prevalence as the other disinfectants mentioned.