Crossflow microfiltration experiments with two magnesium hydroxide suspensions (non-Newtonian, broad particle size distribution) were performed at constant permeate flow rate and under turbulent flow conditions. Critical fluxes (strong form) were measured for different crossflow velocities and concentrations. Fouling experiments were also undertaken and the influence of the crossflow velocity and the permeate flow rate on the cake resistance and specific resistance was studied. It was found that the two suspensions made from the same material, with similar measured particle size distribution and zeta potential but with different rheological and settling properties exhibit very different filtration behaviours. Based on the friction force model [1], a shear stress model which uses the critical flux measurements has been developed to predict the deposit thickness. At the steady state, a good agreement between experiment and theory was found for cakes formed under turbulent flow conditions.