Tubular filtration is commonly used in solid-liquid separation processes. The improvement of tubular filtration models helps raise separation efficiency and saves operation cost. This experiment uses a filter membrane, made of Zirconia, with a mean pore size of 3.5 um is used to filter 15 um PMMA particles. We study the effects of changes in suspension concentration, transmembrane pressure, cross-flow velocity, etc. on filtration rate. Also, we use Computational Fluid Dynamics, CFD, Software Fluent 6.2 to simulate changes in shear-stress on the surface of the membrane to discover tubular-membrane filtration with side-stream, which raises filtration rate and shear-stress on the membrane, also removing fouling on the membrane surface. We then explored the effects of backwash on filtration rate, discovering that backwashing causes the cake to peel off on the membrane surface and cleans the accumulated particles inside the membrane pores.