CUNO self-cleaning metal filter cartridges provide a positive cleaning action, minimizing interruption to service flow. They do not require regular change out and disposal, thereby reducing the operating costs associated with disposable filter cartridges. Each CUNO self-cleaning metal filter cartridge is composed of a stack of alternating metal discs and spacers of uniform thickness, assembled on a rotatable metal shaft. The thickness of the spacer determines the degree of filtration. The self-cleaning filter does not incur the disposal costs, as well as maintenance labor and process downtime associated with changing out disposable filter cartridges. The cartridges are available in a wide variety of sizes as replacement items for CUNO self-cleaning metal filters. The specific cartridge design, material of construction and filtration spacing will depend upon the process application and filter model. CUNO self-cleaning metal filters function by having a fluid pass through the gaps between a series of discs. Periodically, the discs are combed of the particles capture by rotating the discs through cleaner blades incorporated in the cartridge. The particles collect in the bottom sump for draining out as needed. Due to the metal-to-metal contact, the fluid being processed should have some lubricity (i.e. Oils, grease, chocolate).