Which of the following statements about ozone as a disinfectant is NOT true?

Ozone is known for its effectiveness as a disinfectant, particularly in water treatment processes and air purification systems. However, its properties include a very short half-life, which means that it does not have a long-lasting residual effect once it has been applied. As ozone decomposes back into oxygen relatively quickly, it loses its disinfecting capabilities shortly after application. Therefore, the statement regarding its long-lasting residual is not true.

In contrast, ozone does contribute to increased levels of dissolved oxygen in water, an important characteristic for aquatic ecosystems. It is widely recognized for its efficacy in purifying the air by breaking down pollutants and harmful microorganisms, making it an excellent air purifying agent. While ozone is generally considered harmful to aquatic life in high concentrations, under controlled and proper use during disinfection processes, it can be managed to minimize toxicity, although stating it is non-toxic can be misleading without context.

This distinction about ozone's properties is crucial for understanding its application and limitations in sanitation practices.