What does an acid wash do for a pool?

An acid wash is a process used to clean and restore the surface of a pool by effectively removing stains, scale, and other buildups. It typically involves applying a diluted acid solution to the pool surface, which helps break down and dissolve debris such as mineral deposits, algae, or rust stains that can accumulate over time. This procedure is particularly beneficial for older pools or those with significant staining issues, as it can significantly enhance the overall appearance of the pool surface.

In the context of pool maintenance, an acid wash does not function as a sanitizer—it does not kill bacteria or microorganisms in the water. It also does not add minerals to the water or directly adjust the pH level. Instead, its primary purpose is to clean the physical surface of the pool, contributing to both aesthetic appeal and improved water quality by reducing factors that can harbor contaminants. Therefore, option C accurately describes the main function of an acid wash.