Crowns Filter housings is in a wide variety of materials and types of construction, from single filter bag to multi-round cartridges, and offered to suit every application. A well constructed filter housing is a key part of a reliable filtration system. The full range of filter housings available will go along way to giving longevity and value for money to your filtration needs. Filter housings are made of 304 or 316 stainless steel for very good-to-excellent corrosion resistance. Sanitary Metal Filter Housings Along with a cartridge, these housings are used in liquid processing lines to filter contaminants and minimize bacteria growth in food and pharmaceutical plants, as well as other sanitary environments.