When the solid particles in the suspension liquid are large and homogeneous, the filtered filter layer pores are more unblocked, and the filtrate passes through the residue layer. The application of coagulant to assemble the fine particles into larger chunks is advantageous to improve the filtration speed.
For the solid particles settling fast suspended liquid, applied in the filter medium upper feeding filter, so that the direction of the filtration and gravity, coarse particles first settlement, it can reduce the blockage of filtration media and filter residue layer, and the thick solid particles such as diatomite, expansive perlite, etc. are mixed in the refractory suspension liquid (colloid), which can make the residue layer loose and the slurry can be heated to reduce viscosity when the filtrate viscosity is larger. These measures can accelerate the filtration rate.