What should you do if the total alkalinity in the pool is too low?

When the total alkalinity in a pool is too low, adding sodium bicarbonate is the recommended action because it effectively raises the alkalinity level. Total alkalinity serves as the buffer for pH levels, helping to prevent fluctuations that could lead to unsafe water conditions. By introducing sodium bicarbonate, you not only increase the alkalinity but also stabilize pH, promoting consistent water chemistry and providing a more comfortable swimming environment.

Options like adding chlorine primarily affect sanitizer levels rather than alkalinity and could exacerbate existing water chemistry imbalances. Draining the pool is a drastic measure that is unnecessary when an adjustment can be made with a chemical addition. Increasing water circulation can improve overall water quality and help distribute chemicals, but it does not directly address low total alkalinity. Thus, sodium bicarbonate is the most direct and effective solution for correcting low total alkalinity in a swimming pool.