Which chemical is often used to adjust the pH level of pool water?

Muriatic acid is commonly used to lower the pH level of pool water. When the pH is too high, which can happen due to factors like evaporation or adding certain chemicals, adjusting it is essential to ensure safe and comfortable swimming conditions. High pH can lead to scaling on pool surfaces and equipment, lower chlorine efficiency, and irritate swimmers' skin and eyes.

Muriatic acid, a strong acid with the chemical composition of hydrochloric acid, effectively neutralizes alkaline conditions in water, allowing pool operators to bring pH levels down to the ideal range (typically between 7.2 and 7.8). Its effectiveness and availability make it a go-to choice for quick adjustments in pool chemistry.

Other chemicals listed have different functions; for instance, sodium bicarbonate is primarily used to raise alkalinity rather than directly adjusting pH. Calcium chloride increases calcium hardness, and the Poolsafe method typically involves other forms of technology or systems rather than chemical pH adjustment. Thus, muriatic acid stands out as the most suitable option for directly adjusting pH levels.