For the filtration of emulsions and other liquids Depression filter of Leiblein

The depression filter uses a filter fleece medium to filter process fluids. In case of the depression filter, the liquid to be filtered is sucked vertically downwards out of the dirt tank, and through the filter medium. The solid processing residues are thus deposited onto the filter fleece. As time passes, even finer particles are held back,
thanks to the filter cake that is formed. The pumps convey the filtrate directly to the consumers; an intermediate storage tank and additional pumps are not required.

Vacuum-based filtering – technology made by Leiblein Functional principle of the depression filter

The contaminated cooling lubricant is sucked out of the upper dirt tank (❶), such that it passes through the horizontal filter fleece (❷). The processing residues that are retained on the filter fleece form the filter cake (❸). The suction power of the pumps sucks the filtrate downwards into the clean chamber (❹).
As the filter cake becomes denser, the flow resistance increases, and the vacuum in the clean chamber increases as well. When a vacuum limit value is reached or a predefined period of time has elapsed, the regeneration process is initiated: The vacuum is broken.


The filter then undergoes a clocking procedure, whereby the drag chain transports the processing residues forward to the drop ramp (❺). The contaminated filter fleece is cleaned, and a defined length is rolled up (❻). At the rear side of the depression filter, the same length of new filter fleece is fed in by a roller (❼). The filtration cycle begins anew after the regeneration process has been completed. During the regeneration process, the recipients are fed from a clean tank in an uninterrupted manner; this clean tank is positioned on the dirt tank, and it is filled continuously (❽).

Pilot plants of Leiblein

Our products are available to rent for pilot tests. Due to our extensive rental park, we can put together complete test systems individually for your task.

High efficiency Benefits of the depression filter

  • Large filter area and the most minor space requirements
  • High throughput rates
  • Low operating costs, e.g. due to frequency-controlled IE4 pump motors
  • Low-maintenance and user-friendly
  • Fully automatic operations

Types and materials Designs of the depression filter

The depression filter is a rectangular container featuring an integrated chipping discharge facility and a superimposed clean tank. It is therefore particularly compact and spacesaving. The depression filter uses a filter fleece that is selected for the specific filtration task. Thanks to the twin filter design, the required filtrate quantity can quickly be doubled.



coated steel
stainless steel 1.4301/1.4404

Filter fleece

polyester, viscose, polypropylene

Do you have any questions about technical details?

We would be pleased to advice you and will gladly send you more information like type series and measurement sheets of the depression filter.

Versatile application possibilities Areas of application of the depression filter

Videos of the depression filter Benefits of our depression filter in action

Further information Downloads about the depression filter