The crossflow microfiltration characteristics of a dilute suspension containing binary suspensoids with different degrees of filterability are studied under constant pressure. In addition, correlations between filtrate flux and solids mixture ratio are used to investigate the requirements of material added to the main body of suspension to aid efficient crossflow filtration. Empirically, the reciprocal flux is sigmoidal in time with its behavior indicating that there are two stages: initially crossflow medium filtration, and then thin-cake filtration. Three major factors controlling the earlier stage are confirmed: concentration, mixture ratio, and relative force of sweeping and capturing of solids. If these conditions are within a certain level, the earlier stage ceases and thin-cake filtration covers the entire process. The final steady-state flux is related to many operating variables in terms of the shear stress on the cake layer and the coefficient of constant pressure filtration by considering the intensive dependence of the Bur on the mixture ratio. Finally, it is established that for high-rate microfiltration combining body feed with crossflow operation, materials yielding marked sweeping of fouling as well as those producing highly permeable cake can be effectively used regardless of the poor filterability in static filtration.