Star sieves are used in Simplex and Duplex filters for the filtration of liquids. Thus, the use of the sieve forms the core of the liquid filter. It consists of a support body and filter mesh that is pulled over it. Water, oil, lubricants or liquid fuel flow through the filter element from the outside to the inside, thus, dirt particles are filtered out by the filter medium, the cleaned liquid is discharged from the star-pleated filter element and returned to the system.

The contaminated filter chamber is then initially depressurized using the vent screw, the housing cover of the switched-off filter chamber is opened and the star-pleated filter element is pulled out using the sieve frame. The filter element can be freed of coarse particles of contamination by shaking. Adhering contamination is removed by soaking and flushing using a cleaning solvent and, as necessary, light high-pressure cleaning. At the conclusion of cleaning, the filter element is blown out using compressed air. After a maximum of four to five hours, the clean star-pleated filter element can be installed into the filter housing.