When the solid particles in the suspension are large and the particle size is uniform, the pores of the Low Airflow Resistance Precision Filters residue layer are relatively smooth, and the filtrate passes through the filter residue layer at a relatively high speed. The use of a coagulant to aggregate fine particles into larger agglomerates helps to increase the filtration speed.

For the suspension with fast sedimentation rate of solid particles, the filter is applied in the upper part of the filter medium to make the filtration direction coincide with the direction of gravity. The coarse particles first settle, which can reduce the blockage of the filter medium and the filter residue layer; in the difficult-to-filter suspension ( If the solid particles such as diatomaceous earth and expanded perlite are mixed into the colloid, the filter residue layer may be loosened; when the viscosity of the filtrate is large, the suspension may be heated to lower the viscosity. These measures can speed up the filtration.