The scientists conducted experiments to see how to remove phosphorus from drinking water using a process called coagulation. They tested different types of coagulants and pH levels to see which worked best. They found that adding certain chemicals can help improve phosphorus removal. One type of coagulant, poly ferric chloride, was the most effective. The best pH levels for different coagulants were also identified. Removing dissolved phosphorus is harder, but increasing the coagulant amount can help. Certain chemicals can assist in phosphorus removal, but they need to be used carefully.