What is meant by "shock" in pool maintenance?

In the context of pool maintenance, "shock" refers to the process of adding a high dose of chlorine to the water for sanitation purposes. This technique is used primarily to eliminate contaminants, such as bacteria, algae, and other organic matter, which can accumulate in the pool over time. By introducing a large quantity of chlorine all at once, the free chlorine levels in the water increase significantly, which helps to effectively oxidize and kill these harmful microorganisms.

This process is critical for maintaining a clean and safe swimming environment. Regularly shocking the pool is a recommended part of routine maintenance, especially after heavy usage, rains, or when the water chemistry is out of balance. While adding a low dose of chlorine can maintain sanitizer levels, shock treatment with a high concentration is necessary for a thorough cleanse. Lowering the pool temperature or stabilizing pH levels are important for pool health but do not pertain directly to the concept of shocking.