Chitosan was grafted with dimethylamino ethyl methacrylate monomer, and with dimethylamine ethyl methacrylate-acrylic acid monomers. The obtained chitosan poly dimethylamine ethyl methacrylate [I] as well as Chitosan poly- dimethylamine ethyl methacrylate-acrylic acid [II] hybrids were evaluated in flocculation performance of kaolin suspension and also in the clarification behavior of treated raw water when combined with alum. The polymerization was carried out using potassium persulphate/sodium bisulphite redox initiation system at temperature of 60OC for 3 hours. The obtained two grafted samples were characterized using FTIR: thermal properties expressed as thermogravemetric analysis (TGA) and differential scanning calorimeter (DSC) as well as X-ray. The water clarification for kaolin suspension was evaluated for the two obtained hybrid polymers with respect to the pH, polymer dosage, and settling time. The combination between the prepared hybrid and alum was also investigated. The results show that the grafted chitosan copolymers I & II exhibit thermal stability. The best flocculation for two prepared hybrid I & II were observed as pH 6.5 and dosage concentration of 1 ppm with recorded turbidity of 3.01 & 2.66 NTU. The best flocculation was observed for native chitosan at pH 7.5 and 4.85 NTU. Combination between 25 ppm alum with 0.5 of each of I & II induce more water clarification with turbidity values of 1.84 & 1.65.