Background & Aims of the Study: Spent filter backwash water (SFBW) consists of 1-5%of the total treated water typically and it has a high turbidity. Because of the scarcity ofwater resources and in order to prevent the environmental contamination, effluent treatmentof rapid sand filter backwashing is unavoidable. One of the new technologies for removalof turbidity from the effluent is ElectroCoagulation (EC) processes. This study aimed toexamine the efficiency of continuous electrocoagulation in turbidity removal from spentfilter backwash water.Materials & Methods: This study was non-continuous experiment. A rectangular cubeelectrocoagulation tank in 24 cm×17 cm×18 cm dimensions from Plexiglas with the volumeof 7.35 liter was made. In this tank there were 4 metal plates (electrode) (15× 22× 0.1cm);two electrodes as cathode and anode which were made of aluminum and iron, respectively.All of the tests were done in continuous flow. According to the study criteria (Time,Turbidity and pH), 126 sample got with the turbidity 320, 350, 400 NTU from rapid sandfilter backwashing water, so they were tested in current density; 1, 1.4, 1.8, 2, 2.4, 2.8 and3.2 ampere in 3 selected detention times (10, 20 and 30 min). Each experiment wasrepeated two times. In this research the space of electrode and pH is fixed at 1.5 cm and8.2.Results: In this case the highest turbidity removal for Al electrode from rapid sand filterbackwashing occurred in the current density 3.2 ampere, 30 min detention time and 320NTU turbidity. The percent of removal for Al was 95.12. The highest removal for Feelectrode from rapid sand filter backwashing occur in the current density 3.2 ampere, 30min detention time and 320 NTU turbidity. The percent of removal for Fe was 87.40.Conclusion: Regarding to the results of the tests, using electrocoagulation has anappropriate efficiency in turbidity removal.