In chemical manual operations, exposure times for chlorine solution?

• A. At least 30 seconds
• B. At least 60 seconds
• C. At least 5 seconds
• D. At least 10 seconds

Answer: (D)

Exposure time is the period a surface must stay in contact with the chlorine sanitizer to achieve sanitization. For chlorine solutions used in manual operations, surfaces should remain visibly wet for a minimum of ten seconds. This duration gives the chlorine enough time to interact with and inactivate microorganisms on food-contact surfaces such as cutting boards, utensils, and countertops. If the surface dries before reaching that time, the sanitizing effect may be incomplete, so rewet and allow the full contact time to pass. Keeping the sanitizer at the recommended concentration (typically around 50–100 ppm free chlorine) is also essential because the right level works with that minimum time to reliably sanitize. Shorter times aren’t consistently effective, while longer times aren’t typically necessary for standard cleaning tasks.