Residues on food-contact surfaces and equipment can provide an ideal environment for the growth of disease-causing bacteria, which can easily contaminate other foods. Routine cleaning and sanitizing of food-contact surfaces and equipment helps to prevent the growth of bacteria.
Soaking clean equipment in a chemical solution is one way to sanitize food-contact surfaces. Always follow the manufacturer's label instructions; using sanitizers above recommended concentrations does not sanitize better and may corrode equipment. High concentrations can be unsafe and leave an odor or bad taste on surfaces. Low concentrations will not provide disinfection. Chlorine and quaternary ammonium (quat) are commonly used as chemical sanitizer solutions in food service operations, but other suitable sanitizers are detailed in 4-501.114 of OAR 333-150 (the Oregon food code).
Sanitizer | Concentration | Temperature | Contact time |
Chlorine (bleach**) | 50-100 ppm | 55-75⁰F | 10 seconds |
Quaternary ammonium (quat) | 200-400 ppm | Stable at high temperatures of up to 100⁰F | 30 seconds |
**Note: Ensure that your bleach is safe to use for food contact surfaces.
Heat is another way to kill microorganisms present on clean food contact surfaces of equipment. For manual warewashing using heat, soak all equipment in water maintained at or above 171⁰F for at least 30 seconds. For mechanical warewashing, water temperature and pressure requirements vary depending on the type of machine being used. More detail can be found in 4-501.110 and 4-703.11.
- Properly label spray bottle(s) “sanitizer,” or name of chemical.
- Never spray around open food and only where foods are protected with an impermeable cover.
- Replace solutions when the concentration gets weak or when the solution becomes cloudy.
- Allow for the appropriate contact time before wiping off.
- Use disposable cloths for use with spray bottles. Do not use cloth towels.