What does it mean to "shock" a pool?

"Shocking" a pool refers specifically to the practice of adding a high dose of chlorine or other chemical treatment to the water in order to effectively eliminate contaminants, such as bacteria, algae, and organic matter. This process raises the chlorine level significantly, which serves to oxidize these unwanted substances. It is a critical maintenance procedure that ensures the water remains safe and clean for swimming, particularly after heavy use, significant rainfall, or the detection of algae blooms.

By employing this shock treatment, pool owners can quickly restore water quality and clarity, which is essential for maintaining a safe swimming environment. This method is different from merely cleaning the surfaces of the pool or addressing water temperature or debris, as it specifically targets the chemical balance and sanitation of the water itself.