Water is very useful to human beings, plants and animals. Apart from consumption in the case of portable water, the non- portable water is also useful in some instances, however, sometimes it contain some bacteria which need to be disinfected. This research work was carried out to disinfect gray water obtained from students’ hostel at main campus of Bayero University, Kano. Crude extract of this plants’ pod was injected into water treatment sequence. The result indicates a considerable reduction in the concentration of bacteria present in the grey-water samples. It revealed that addition of 100 mg/L of 0.5% (w/v) and 1.0% (w/v) M. oleifera pod extract were only effective in removing bacteria up to 6.9% and 12.4% respectively

Keywords : Moringa oleifera (M.O), Water soluble, Coagulants, Coagulation, Waste water, Crude extracts, Concentration, Bacteria, Grey-water.