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 other bodies of water. This chemical works primarily as an algaecide by disrupting the metabolic processes of algae, leading to their death. When copper sulfate is introduced into the water, it can reduce the population of harmful algal blooms that can deplete oxygen levels and produce toxins, thus improving water quality.

In practical applications, it's important to note the dosage and water conditions, as excessive use can lead to adverse effects on aquatic life. The effectiveness of copper sulfate is also influenced by factors such as pH levels and the presence of organic matter.

Aluminum sulfate is mostly used for water clarification and does not specifically target algae. Calcium carbonate and sodium bicarbonate are primarily utilized for pH adjustment and do not serve as algaecides.