How can you decrease the pH using sodium bisulfate?

Using sodium bisulfate to decrease pH is most effective when it is mixed with water before adding it to the pool. This dilution allows for a more controlled application and helps ensure that the chemical is evenly distributed throughout the water. When sodium bisulfate is added directly in powder form, it can cause localized lowering of pH where it lands, potentially leading to damage in that area or resulting in uneven treatment of the pool water. Mixing it with water creates a solution that can be introduced into the pool more uniformly, minimizing the risk of cloudiness and ensuring that the desired decrease in pH levels occurs gradually and safely.

Dispersing it across the surface, adding it directly to the skimmer, or using it with other chemicals can lead to less effective pH control and may pose safety concerns or risks of improper chemical interaction. Thus, mixing with water is the recommended method for effective application.