What is a common algaecide utilized for controlling algal growth?

Copper sulfate is widely recognized as an effective algaecide for controlling algal growth in a variety of aquatic environments such as ponds, lakes, and swimming pools. Its mechanism of action involves disrupting the cellular processes of algae, leading to their death, thus helping to manage algal blooms. This makes it a preferred choice in water treatment practices where the goal is to maintain water clarity and minimize harmful algal effects, especially in recreational waters.

Other substances listed, while important in various contexts, do not serve as primary algaecides. For example, sodium bicarbonate is primarily used to adjust pH levels, chlorine is effective for disinfection but does not specifically target algae, and calcium carbonate is used to stabilize pH and hardness in water but also does not have direct algaecidal properties. Therefore, copper sulfate stands out for specifically addressing algal issues.