Which of the following is the acceptable level of total dissolved solids in a swimming pool?

The acceptable level of total dissolved solids (TDS) in a swimming pool is typically considered to be less than 1500 ppm (parts per million). Maintaining TDS within this range is essential for several reasons. High levels of TDS can lead to water quality issues such as decreased efficiency of disinfectants, increased likelihood of corrosion or scaling, and overall discomfort for swimmers.

When TDS levels exceed this threshold, the water may become cloudy, and the pool's chemical balance can be disrupted, making it harder to maintain proper sanitation levels. Additionally, elevated TDS can affect the effectiveness of chlorine and other sanitizers, which are crucial for ensuring a safe swimming environment. Hence, keeping TDS below 1500 ppm is important for both water clarity and swimmer safety.