a polyamine or other cationic polymers some of the cationic or anionic aluminum compound can be mixed with the anionic colloidal microparticles prior to addition to the furnish best results in the process of this invention are achieved when the following order of addition to the furnish is followed first cationic aluminum compound and anionic aluminum compound separately but substantially simultaneously then cationic low molecular weight coagulant polymer followed by cationic high molecular weight polymer then anionic colloidal microparticles and finally anionic high molecular weight flocculent polymer the following examples illustrate the process of this invention drainage measurements were carried out using the canadian standard freeness test turbidity measurements of the white water from the freeness test provided an accompanying measure of degree of retention of pulp fines and filler mixing was conducted in a britt jar at an agitator speed of 750 rpm in all examples the same conditions of mixing and order of addition of components were maintained all weights are based on the dry weight of the furnish preparation of paper using cationic alum anionic sodium aluminate combination and polysilicic acid microgel in groundwood paper furnish an unbleached groundwood paper furnish of 0 3 wt consistency solids content at ph 8 was.