Which chemical compound is commonly used for the granular chlorination of swimming pools?

Calcium hypochlorite is commonly used for granular chlorination of swimming pools because it is a stable and effective chlorine compound that dissolves well in water, providing a quick increase in available chlorine levels when added to pool water. It is also favored for its high chlorine content, which significantly helps in sanitizing the water and controlling algae and bacteria.

This compound is particularly advantageous for outdoor pools due to its resistance to sunlight degradation compared to other chlorine sources. Additionally, calcium hypochlorite provides a source of calcium, which can help maintain the overall balance of pool water chemistry, especially in plaster pools. Its granular form allows for easy handling and precise dosing, making it a preferred choice for many pool operators when needing to elevate chlorine levels effectively.