One of the promising technologies for the removal of suspended particles is coagulation and flocculation. The present study is aimed to examine the effect of alum as a coagulant in conjunction with polyelectrolytes as a coagulant aid for removal of turbidity from different water samples. The tests were carried out for four water samples i.e. well water, pond water, river water and canal water having 96NTU, 189NTU, 249NTU and 333NTU turbidity respectively. A conventional jar test was conducted for removal of suspension by determining the optimum mixing intensity and proper dosage. The four different polyelectrolytes used here are magnafloc LT-31, magnafloc LT-27, accofloc A-110 and aronfloc C-510.The aim of this research paper is to evaluate the effect of these synthetic polyelectrolytes used as coagulation and flocculation aids in different turbid water and determination of their effectiveness for the treatment of water. Results of these evaluations reveal that LT-31has shown better flocculation strength than other three polyelectrolytes in pond and river water for pH values of 8.22 and 8.68. On the other hand accofloc A-110 has shown best result in well water and canal water for pH values of 7.10 and 7.65 respectively. We demonstrate an efficient approach for optimization of coagulationflocculation process which is appropriate for raw water treatment
