Which of the following chlorine levels is considered safe for swimming pools?

The range of 1-3 mg/L for chlorine levels in swimming pools is considered safe and effective for maintaining water quality and ensuring swimmer safety. Chlorine at these levels is sufficient to disinfect the water by killing harmful microorganisms while also being low enough to minimize potential irritation to the skin and eyes of swimmers.

This range balances the need for sanitation with comfort; levels below 1 mg/L might not provide adequate disinfection, leaving the pool vulnerable to bacterial growth and other contaminants. Conversely, while higher levels, such as 2-10 mg/L, and 5-7 mg/L are still commonly mentioned, they can lead to an overwhelming chlorine smell and discomfort for users, potentially causing skin or eye irritation. Ensuring that chlorine levels remain within the recommended 1-3 mg/L range is key for optimal swimming conditions.