What is commonly used to control the growth of algae in water bodies?

Copper sulfate is commonly used to control the growth of algae in water bodies due to its effectiveness as an algaecide. When introduced into water, copper sulfate releases copper ions, which are toxic to many types of algae. This chemical helps to clarify the water and can significantly reduce algal blooms, promoting better water quality for recreational activities and aquatic life.

Chlorine is primarily used for disinfection purposes in water treatment but is not specifically targeted at algae. While it can have some effect on algae, its primary role is to kill bacteria and viruses.

Activated carbon is utilized mainly for removing organic matter, odors, and other contaminants from water. It does not have a direct impact on algae growth.

Calcium carbonate is often used to stabilize pH levels in water and can help prevent corrosion, but it does not control algae effectively. Thus, for specifically targeting the control of algae, copper sulfate remains the most reliable choice.