What is the main purpose of opening the faucets until the water runs clear during de-winterizing?

The main purpose of opening the faucets until the water runs clear during de-winterizing is to ensure that all antifreeze or any remaining winterizing fluid is flushed out of the plumbing system. During the winterization process, antifreeze is added to the plumbing lines to prevent water from freezing and causing damage. When de-winterizing, it's crucial to remove this antifreeze to ensure the water is safe and suitable for use.

As faucets are opened, water pressure helps push out any residual antifreeze along with any trapped air, ensuring that the lines are cleared and ready for normal use. This process also helps confirm that the plumbing system is functioning properly without any blockages.