The Static Mixer is a motionless mixer in which fluids are injected and rapidly mixed by combination of alternate vortex shedding and intense shear zone turbulence. It is a compact mixing plate with injection nozzles on two sides to ensure excellent distribution (figure 1 below). Moreover, it has bent tabs (which are designed using Computational Fluid Dynamics Modeling) to generate an efficient mixing with minimal pressure drop and maximum salt removal & chemical effectivness of the crude oil. This subject technology is aimed to optimize the wash water (underground water) & treating chemicals consumption in Gas Oil Separation Plants (GOSP). Also, it is aimed to achieve efficient blending between the crude oil stream and secondary streams resulting in high process efficiency with low consumptions of resources.