Illinois Plumbing Code Practice

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How long should a potable water system be filled with chlorine solution before use?

  1. 12 hours 3

  2. 24 hours 6

  3. 24 hours 3

  4. 12 hours 6

The correct answer is: 24 hours 3

The correct duration for filling a potable water system with a chlorine solution before use is 24 hours. This timeframe is crucial for ensuring that the chlorine effectively disinfects the system, helping to eliminate bacteria and pathogens that may pose health risks. The chlorination process involves thoroughly mixing the chlorine with the water and allowing it sufficient time to contact all interior surfaces of the pipes. While the other options suggest shorter durations, they may not provide enough time for adequate disinfection, particularly in larger or more complex plumbing systems where water flow and contact time can vary significantly. Achieving a comprehensive and uniform disinfection throughout the entire system is essential for maintaining water quality and safety. Therefore, allowing 24 hours for the chlorine solution to sit is the best practice for ensuring a safe and potable water supply.

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