Copper Sulphate is a blue crystalline compound widely used as an algaecide in swimming pools, ponds, and fountains. It is highly effective in killing various types of algae by disrupting their cellular processes, making it a fast-acting solution for green, black, and mustard algae infestations. A small, carefully measured dose can restore clear, healthy water. However, overuse of copper sulphate can stain pool surfaces, damage equipment, or harm aquatic life, especially in natural ponds. Therefore, it's essential to monitor copper levels and maintain proper water balance, especially pH and total alkalinity. With correct dosing, it remains a reliable and cost-effective algae control solution.