Millennium-Filters hydraulic cartridges are built to provide superior protection from particles and contamination that can result in inefficiency, downtime. Proper fluid cleanliness levels are critical for components in the hydraulic fluid stream. Types of filtration media used depend on the application. Millennium Filters use microglass media, stainless steel mesh, or paper media. Micron ratings range from 250 microns down to 1 micron. These hydraulic cartridges are essential in reducing operating expenses.