Filter Sciences Bag Filtration Housings are engineered for durability and designed for convenience. Why do we only sell Stainless bag Steel Housings? In short, because they last! We have been in the filter business for over 35 years and we have been down that road. Stainless offers significant benefits over standard carbon steel. Stainless is much more resistant to corrosion. Can be easily cleaned and sanitized which broadens its use in a variety of applications.