The goal of the study was to test different chemicals to see which one is best at cleaning up dirty water. The researchers used a special device in a lab to compare how well each chemical worked at removing dirt from the water. They found that poly aluminum chloride with a low concentration was the most effective at cleaning the water, leaving it very clear. The more of this chemical they used, the faster the dirt settled to the bottom. They also noticed that the water became a bit more salty and less alkaline when they added the chemicals. Overall, poly aluminum chloride was the best at getting rid of dirt in the water.