FSI Filter Bags: Filter Socks for Industrial Applications

Learn More About Our Versatile Filter Bags

Multiple filtration uses require multiple filter types and sizes. Pall’s FSI™ filter bags (filter socks) come in a variety of materials and styles with a wide assortment of collar and ring types that ensure compatibility with nearly all bag vessels on the market. Most of our filter bags come standard with the patented Polyloc® sealing ring that provides a complete hermetic closure that eliminates the possibility of migration.


Pall’s FSI filter bag products provide efficiency with both low cost and use.  We supply higher solid loading, superior chemical compatibility, consistent quality and performance supporting the fluid processing needs in a variety of Oil & Gas, Chemical, and Industrial applications. 


Pall FSI Filter Bags

Standard Felt 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. 

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170+ Part numbers available

Mesh Filter Bags

Pall’s FSI Mesh Filter Bags in nylon monofilament, polyester multifilament and polypropylene monofilament offer a broad range of chemical compatibility, high strength, and consistent performance; supporting low cost filtration needs in a variety of Oil & Gas, Chemical, and Industrial applications.


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250+ Part numbers available

PolyMicro® Filter Bags

Pall’s FSI Polymicro® Microfiber Filter Bags utilize proprietary non-foaming microfiber polypropylene with triple-layer construction that provides product cleanliness, outstanding performance and higher contaminant loading in chemical and coating applications where minimizing particle travel is important; offering easy change-out for reduced down time and longer service life than the competition.

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15+ Part numbers available

Extended Life Filter Bags

Pall’s FSI Extended Life Filter Bags have a coarse inner layer, graded pore structure, and greater depth than standard bags providing excellent filtration performance and twice the standard dirt-holding capacity; offering longer service life and fewer change-outs, ideal for customers with applications in automotive coatings, chemicals, resins, edible oils and other fluid applications.

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10+ Part numbers available