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

Baking soda, or sodium bicarbonate, is commonly used to raise the pH level of pool water. When added to the water, it acts as a buffer to stabilize and elevate the pH levels. Maintaining proper pH is crucial for pool water balance, comfort for swimmers, and the effectiveness of disinfectants.

This choice is favored because it not only raises the pH but also helps to increase alkalinity, which is essential for ensuring that the pH does not fluctuate dramatically. Balancing both pH and alkalinity contributes to overall water quality and helps to protect pool equipment from corrosion and damage.

Calcium chloride is primarily used to raise calcium hardness, which does not impact the pH level directly. Hydrochloric acid is used to lower pH levels rather than raise them, and potassium sulfate is typically used in specific scenarios related to water chemistry but does not have a role in adjusting pH. Thus, among these options, baking soda is the most suitable choice for increasing the pH of pool water.