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The recommended pH level for swimming pool water is between 7.2 and 7.8. This range is optimal for several reasons. Maintaining the pH within these levels helps ensure that the water is neither too acidic nor too alkaline, which can affect water quality and swimmer comfort.

When the pH is maintained in this range, it not only helps to protect pool equipment and surfaces from corrosion or scaling, but it also enhances the effectiveness of disinfectants, such as chlorine. Chlorine works best at this pH level, ensuring that bacteria and contaminants are effectively treated. Additionally, water at this pH range is more comfortable for swimmers, reducing skin and eye irritation.

Options that fall outside the 7.2 to 7.8 range can lead to various problems. For instance, a pH below 7.2 can lead to increased corrosion of metal fixtures and irritation of skin and eyes. Conversely, a pH above 7.8 can cause issues such as cloudy water, scaling, and reduced effectiveness of chlorine, which can lead to inadequate sanitation. Therefore, maintaining the pH level within the recommended range is essential for both safety and comfort in a swimming pool environment.