Which of the following best describes the use of an air gap?

An air gap is a crucial practice in food safety and plumbing that serves to effectively separate safe water from potential contamination. This physical separation prevents backflow, which is the unwanted reversal of water flow that can lead to the mixing of clean and contaminated water. By maintaining a designated space between the end of a water supply outlet and the flood level of the receiving container, an air gap ensures that any potential contaminants cannot flow back into the clean water supply.

This method is particularly important in food service operations like Chipotle, where maintaining food safety standards is vital. Unlike other options, which may suggest various functions of water systems, the use of an air gap is specifically designed for protection against contamination. It provides a reliable barrier, ensuring that health standards are upheld and that the water used in food preparation remains safe.