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Beer Filtration
Deep Bed Filtration
Depth filters are made from a great variety of materials, including melt-blown polypropylene, polyolefin, and polyester. Yarn-wound cartridges are available and also offer the advantage of being made from a variety of materials. Cartridges with a pleated medium are also available. These materials can filter particles of less than one micron to more than 100 microns in size. Retention mechanisms for depth filters are usually rated "nominally" at a specified percentage. For example, a 2 micron nominal filter cartridge should retain 90% of 2 micron particles. This percentage rating may be manufacturer-dependent.
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