The chemical used for coagulation in water purification is

The chemical used for coagulation in water purification is Aluminium tetraoxosulphate (VI), also known as Aluminium sulfate. This chemical is added to water in small amounts and it helps to coagulate or clump together the fine particles that are suspended in the water, making them easier to remove through sedimentation and filtration. The coagulated particles include dirt, debris, organic matter, and microorganisms that may be present in the water. This process helps to improve the quality of the water by making it clearer, reducing unpleasant odors, and removing harmful substances.