What chemical is typically used to correct low total alkalinity levels in a swimming pool?

Sodium Bicarbonate is specifically used to raise total alkalinity levels in swimming pools. Total alkalinity acts as a buffer for pH levels, helping to stabilize them and prevent significant fluctuations. When total alkalinity is low, it can lead to unstable pH levels which can cause issues such as corrosion of metal components in the pool, discomfort to bathers, and decreased effectiveness of chlorine.

Adding Sodium Bicarbonate increases total alkalinity without significantly affecting the pH level. It dissolves easily in water and is safe to handle, making it a popular choice for pool maintenance.

The other options do not serve the same purpose: Calcium Chloride is primarily used to increase calcium hardness rather than alkalinity. Borax can raise pH but is not generally used for alkalinity adjustments. Sodium Hypochlorite is a chlorine-based sanitizer, primarily used for disinfection and does not affect total alkalinity directly. Understanding the specific role of each chemical in pool maintenance is crucial for proper management and water quality.