This study covers the experimental results of the pressure filtration of fine suspensions of quartz, calcite, dolomite, and kaolin minerals carried out in the presence of borax and surfactants in the slurry. Anionic, cationic, nonionic and amphoteric surfactants were used in the experiments, and very drastic increases were obtained in the filtration rates of all the mineral slurries. When 3 % w/w borax and 50 g/t surfactant were present in the mineral suspension, the filtration rate increased for about 15-17 times, especially for the use of dolomite filter cakes. Even with kaolin, the filtration rate increased for 2-2.5 times when these reagents were used simultaneously. It was determined that the minerals gained high negative zeta potential values, about -34 to -36 mV, in the presence of 3 % borax. The filter cakes containing particles with higher surface charges and adsorbed surfactants on their surfaces showed relatively small specific cake resistances. These cakes became incompressible and provided very high filtration rates.