Which statement best describes the activity level of a solution at 200 ppm?

• A. It is close to being inactive
• B. It kills bacteria
• C. It is highly corrosive
• D. It is ineffective

Answer: (B)

Concentration in ppm correlates with how active a sanitizer is against microorganisms. A 200 ppm solution has a substantial amount of the active chemical per liter, which is within the range commonly used to achieve bactericidal effects under proper contact time and conditions. This level is sufficient to kill bacteria, not simply inhibit them or be ineffective. While corrosion depends on the specific chemical and materials involved, the statement that best describes the activity against bacteria at this concentration is that it kills bacteria.