This study delves into the mechanisms underlying coagulation as a primary treatment method, exploring the role of coagulants in destabilizing suspended particles, organic matter, and dissolved pollutants.It investigates the various types of coagulants commonly used, such as inorganic coagulants (Aluminum sulfate, ferric chloride) and organic coagulants (Poly-aluminum chloride, polyamine-based polymers), analyzing their specific functionalities and optimal application conditions.Furthermore, this study addresses the challenges associated with coagulant-based water treatment, including dosage optimization, coagulant selection, and the influence of water quality parameters on treatment efficiency.It examines the impact of pH, temperature, turbidity, and the presence of interfering substances on coagulation performance, emphasizing the need for tailored approaches in different water treatment scenarios.