The researchers studied a system called BPACS to remove harmful substances from raw water at a treatment plant. They found that BPACS effectively reduced the levels of certain chemicals that can affect water quality. By using BPACS, the system was able to lower the concentration of organic carbon in the water, as well as remove harmful disinfection by-products. This research shows that BPACS is a valuable tool for improving the quality of drinking water by efficiently treating these harmful substances.