Which substance can control algae at the intake of a water supply?

Copper sulfate and potassium permanganate are effective substances used for controlling algae in water supply systems. Copper sulfate acts as an algicide, inhibiting the growth of algae and helping to maintain water quality. It disrupts cellular processes within the algae, leading to cell death and decreased population levels. Potassium permanganate, on the other hand, is an oxidizing agent that can also help in removing organic material and oxidizing compounds associated with algae, thus supporting the reduction of algae blooms.

Using these substances together targets both the algae and the potential organic matter that can propagate algal growth, ensuring a more comprehensive approach to maintaining water clarity and taste. This method is often employed in municipal water treatment facilities to ensure that water remains safe and palatable for consumption.

While other substances listed might have different applications in water treatment, they do not specifically target algae control in the same manner as copper sulfate and potassium permanganate.