What chemical is commonly used to kill algae in a lake?

Copper sulfate is widely recognized for its effectiveness in controlling algae growth in lakes and ponds. This chemical acts as an algaecide, disrupting the metabolic processes of algae and thus inhibiting their growth. When applied to water bodies, it leads to the death of various types of algae, helping to maintain water quality and clarity.

In contrast, sodium bicarbonate is primarily used as a buffering agent to stabilize pH levels rather than for algae control. Aluminum sulfate, while beneficial in coagulating particles and improving water clarity, does not specifically target algae. Magnesium chloride can be useful in other processes, such as reducing road dust or as a de-icing agent, but it is not known for its effectiveness against algae. Thus, copper sulfate stands out as the chemical of choice for algae management in aquatic environments.