 This study prove the reduction of TSS, COD, and BOD with addition of EM.Furthermore, it states that “Addition of effective micro-organisms (EM) to the raw greywater enhance the settling and aeration process effectively” and “increasing the EM dose to 1.5ml/L and settling time up to 4.5 h followed by aeration for 90 min could improve the final effluent up to the permissible level”.This final effluent meets the ‘Egyptian Guideline’ for unrestricted water reuse.