Final answer:
Sanitizer buckets should be changed whenever they run out or to maintain proper solution concentration, which is critical for effective pathogen elimination and food safety.
Step-by-step explanation:
The question 'How often should sanitizer buckets be changed?' falls under Health and Safety, specifically within food service guidelines. The correct answer to the question is d) Whenever they run out or as needed to maintain the correct sanitizing solution concentration. Sanitizer buckets should be checked regularly to ensure the sanitizing solution is at the correct strength, which is typically measured by parts per million (ppm) of the sanitizer chemical. For example, chlorine-based sanitizers often require a concentration between 50 ppm to 100 ppm. Whenever the sanitizer solution becomes too weak, diluted, or contaminated, it must be replaced with fresh solution to ensure that it is effective at killing pathogens. This practice is crucial in maintaining food safety standards and preventing foodborne illnesses.