Laboratory unit was designed to simulate (T2) line in Alrustamyia station for sewage treatment southern part of Baghdad city . The work involved two stages, before and after prearation tank and primary settling tank. Storage wastewater samples problem was overcome through using rotary cooling system at 2 C . The encouraging results obtained from previous work (new chemical treatment of prearated wastewater) were employed for the completion of our continuous feeding experiments on a laboratory unit scale . The flow rate was used as a control factor for monitoring the concentration of pollutants in the treated wastewater treated . The selected flow rate included the basic design flow rate of the T2 line (1X) and new flow rates (2X and 4X). The our new techniques involved the continuous feeding were reduced the concentrations ofBiological Oxygen Demand (BOD), Total Suspended Solid (TSS), liberated the entrapped oil and greases as well as reducing other pollutants. It was found that 2X flow rate was the best flow rate which doubled the quantity of wastewater treated and reduced the resident time of treatment to the half.