The researchers tested a new water treatment system that combines coagulation, flocculation, and flotation processes to clean cold water effectively. They found that using a certain type of coagulant called PACl at a lower dosage can work just as well as traditional coagulants like AS, leading to faster treatment times and lower costs. By using a combination of a DAF reactor, PACl coagulant, efficient flocculation reactor, and auto-dosing system, the system can achieve its goal of providing high-quality water treatment.