Which condition reduces chlorine's bactericidal effect when sanitizing utensils?

• A. Food residues are present
• B. The chlorine solution is tepid water
• C. More chlorine is used than directions call for
• D. The solution is made on an available chlorine basis

Answer: (A)

Food residues provide organic matter that reacts with chlorine, consuming the available chlorine and lowering the free chlorine concentration needed to kill bacteria. When organic load drains the sanitizer, its disinfecting power drops, so microbes are more likely to survive. This is why pre-cleaning to remove soil and debris is essential before sanitizing. Temperature and concentration adjustments can influence speed and strength, but the presence of food residues most directly reduces chlorine’s effectiveness. Making the solution on an available chlorine basis and using the right amount ensures the sanitizer is measured by the active chlorine that actually disinfects.