Flocculation and sedimentation are widely employed in the purification of drinking water as well as in sewage treatment, storm-water treatment and treatment of industrial wastewater streams. Typical treatment processes consist of grates, coagulation, flocculation, sedimentation, granular filtration and disinfection. As the demand for eco-friendly solutions in the flocculation process continues to grow, biopolymers are emerging as a highly promising solution. Among these, chitosan stands out for its exceptional properties, making it a top contender in this environmentally-conscious endeavor. Chitosan is not only biodegradable but also exhibits a unique ability to bind with a wide range of contaminants, including heavy metals and organic pollutants, effectively removing them from water sources.