Which of the following is true about sodium bicarbonate?

Sodium bicarbonate, commonly known as baking soda, is primarily used to raise alkalinity levels in pool water. Alkalinity acts as a buffer for pH levels, helping to stabilize them and prevent sudden shifts that can occur due to various factors like pool usage, environmental changes, or the addition of other chemicals. By increasing the total alkalinity, sodium bicarbonate ensures that the pH remains more stable, which is crucial for maintaining proper water balance and protecting pool surfaces and equipment.

In contrast, its role is specifically in relation to alkalinity management, rather than lowering pH levels or raising calcium hardness. While it can indirectly influence pH, it is not a method for reducing acidity. Additionally, it does not have bactericidal properties, so it does not serve as a disinfectant or sanitizer in pool water management. Understanding the correct usage of sodium bicarbonate is key for effective pool chemistry maintenance.