Rexroth depth filter elements CELLUDISC are used for the microfiltration of fluids requiring a very high oil cleanliness. Typical applications are: filling filtration, supporting filtration in the bypass and flushing of hydraulics and lubricating oil systems. The main filter variables, such as retention rate, dirt holding capacity and pressure loss are determined by the inserted filter elements and the filter media used in them. Due to the high retention rate, the main flow filter is supported by a supplementary filtration in the bypass