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Pall's FSI Filters Series of Filter Bags & Vessels


Important FSI Product Discontinuation Announcement:


Pall Corporation’s goal is to provide a range of high-performance, differentiated filtration and separation solutions and services. To continue to deliver the high-level of support and expertise you expect, we will focus our filtration product range to solutions that drive the most value to help customers solve some of their most complex and critical challenges. With this new focus, all FSI® products will stop being manufactured on December 31, 2020.  To learn more about this announcement and the products impacted, please read here.


As a leader in the development and manufacturing of filtration and separation products, Pall has the experience and expertise to provide and service a variety of filter bags, vessels, and accessories to address your unique application.  Pall's FSI Filter Series of high quality and economical filtration products is broadly recognized and admired in the filtration industry.  




FSI Filter Bags


Pall’s FSI Standard Felt Filter Bags include a broad and comprehensive line of sewn or welded seam in polypropylene or polyester media, provide higher solid loading, consistent quality, and performance supporting low cost filtration needs in a variety of Oil & Gas, Chemical, and industrial applications. 




FSI Filter Vessels


Our Filter vessels are expertly engineered for reliability and ease of use; you’ll find our filter vessels will make your fluid lines more productive and effective.




FSI Filter Spare Parts


Pall offers a comprehensive range of spare parts to support your FSI Filter Bag Vessels & Housing systems.  Search for gaskets and orings, baskets, bag magnets, evacuation floats, adaptors and kits and more.  Most items are available for convenient online purchase. 




FSI Filters Address a Variety of Industry Filtration Needs


  • Advanced Coatings & Photo emulsions
  • Chemical Processing
  • Electronics
  • Food & Beverage
  • General industry
  • Automotive
  • Health Care Processing
  • Paints & Coatings
  • Oil & Gas



Filter bags (also sometimes referred to as filter socks) are available in standard felt, extended life, mesh, microfiber, and absolute rated melt-blown depth media.  Pall offers all industry-standard bag sizes, micron ratings, materials, and configurations such as single or multi-layer.  Our technical experts are experienced in helping customers to select the best filtration solution according to operational and performance requirements.  Our bags are available in a wide assortment of collar and ring types that ensure compatibility with most bag vessels on the market.


FSI Filters were the first to introduce the Polyloc® bag ring, which completely eliminates the need for under-basket gaskets, as it hermetically seals to prevent liquid bypass and eliminates the possibility of fiber migration.  Polyloc® rings are designed with built-in handles to make bag removal easier, which helps prevent spillage and supports health and safety in the workplace.


In addition to our filter bag offering, FSI filters series is also known for high-quality steel bag filter vessels (or filter pots) and plastic convertible filter housings.  Our most popular FSPN series of filter vessels are designed, built, and stamped to meet code requirements in our own ASME Code manufacturing facilities.  These vessels can be configured as single or multi-round using industry-standard size 1 or 2 filter bags.  Standard equipment features a single-gasket seal and sturdy perforated metal baskets to provide durable and consistent performance.  Other popular and cost-effective vessels are our cast CBFP line as well as our highly adaptable and versatile X100 and XL234 Plastic Vessels.   


To ensure comprehensive application support, Pall also carries all the accessories and spare parts that you may need to service your FSI filters products in the field, including gaskets, o-rings, baskets, kits, bag magnets, and others.  


If your application requires the ease-of-use of a bag filter system with the high performance of a cartridge filter, upgrading to Pall Filters may be advantageous.  Pall's Marksman™ Series of cartridge filters provide customers with a cost-effective alternative to bag filters.  Find out more about Marksman filters by visiting the links below.



Pall continues to develop filtration products that revolutionize the industry.  Learn how our FSI filters series or a Pall filter can support your needs.  



Contact us with your questions about FSI products

About FSI Filters

  • Pall Corporation, a global leader in filtration, separation and purification aquired FSI Filter Specialists, Inc. 
  • The following are registered trademarks of Filter Specialists, Inc.: Polyloc®, Polymicro®, Polysorb®, Polyweld®, Polywound®, Vorex® and ClearPleat®.


We continue to develop filtration products that revolutionize the industry - explore how FSI filters can help you with your filtration requirements.