Ozone as a disinfectant has which of the following characteristics?

• A. Ozone is a strong oxidant that leaves no chemical residual and is typically more costly to operate.
• B. Ozone leaves a persistent chlorine residual.
• C. Ozone is inexpensive to operate and widely used as first choice.
• D. Ozone also provides a long-lasting disinfectant residual.

Answer: (A)