MRO Field Guide

Filtration Separation: Bag Housing, Filter Sock, or In-Line Air Filter?

From a $19.99 1-micron filter sock to a $550 stainless bag housing, this filtration separation comparison helps you match the right filter to your liquid or compressed-air line.

Last updated Aug 17, 2026

Filtering is the part of a production line everyone forgets until something clogs or a tool wears out. Filtration separation covers everything from straining a solvent before it reaches a pump to pulling water and debris out of compressed air. The challenge is that the right solution depends on what you're filtering and how permanent you need the setup to be. The listed prices in this group spread widely, from a single filter sock to a stainless bag filter housing. That spread makes sense: a consumable sock and a permanent vessel do very different jobs.

Quick Take

The Filtra Systems bag filter housing is the permanent vessel, built around a single support basket. The Millipore Filter Housing SH011 is the cartridge-style alternative with a polished finish. The Industrial filter bag offers fine liquid filtration in a consumable format. The High Flow Industrial Air Filter is the inline choice for air-line protection.

Listed-Price Comparison

The table below shows the four options by listed price.

ProductListed PricePrice Bar
Filtra Systems FSC Bag Filter Housing 304 Stainless Steel 150 PSI IndustrialUSD 550.00
Millipore Filter Housing SH011 H2FBSH011T USED (Best OfferUSD 479.20
Industrial filter bag, 1 Micron Filter Sock Bags, Water Liquid Oil Dust Fuel-1umUSD 19.99
High Flow 5 Micron Industrial Air Filter with Auto Drain & Metal BowlUSD 73.99

Decision Matrix

Use CaseBetter FitWhy
Fine liquid filtrationIndustrial filter bagWelded and sewn PE media for water, ethanol, methanol, and oil
Air-line protectionHigh Flow Industrial Air FilterIn-line water trap and particulate filter for air-line systems
Permanent housing for liquid bag filtrationFiltra Systems FSC Bag Filter HousingSingle-basket support for bag media
Lab-scale cartridge filtrationMillipore Filter Housing SH011Cartridge-style basket with polished finish

Product Notes

Filtra Systems FSC Bag Filter Housing 304 Stainless Steel 150 PSI Industrial

Filtra Systems FSC Bag Filter Housing 304 Stainless Steel 150 PSI Industrial

This used bag filter housing is built around a single basket/bag support, so it takes one filter bag at a time. The 304 stainless steel construction and the 150 PSI nameplate rating make it suitable for process-liquid lines where you want a serviceable housing rather than a disposable filter. The unit is listed as used, which is the main drawback: you are buying a pre-owned vessel instead of a new one. If you already have bag media and need a permanent housing for water, coolant, or oil filtration, this is the piece to build around.

Millipore Filter Housing SH011 H2FBSH011T USED (Best Offer

Millipore Filter Housing SH011 H2FBSH011T USED (Best Offer

This housing is designed for cartridge filtration, not bag media. It comes from Millipore and uses a single-cartridge basket, with a highly polished finish described as in excellent cosmetic condition. The unit is used, and the original packaging shows creasing and handling marks, so the box is not pristine. The listing also includes a Best Offer option, meaning the listed price is negotiable. For a lab-scale setup that relies on cartridge filters, this gives you a cartridge housing from Millipore in the used market.

Industrial filter bag, 1 Micron Filter Sock Bags, Water Liquid Oil Dust Fuel-1um

Industrial filter bag, 1 Micron Filter Sock Bags, Water Liquid Oil Dust Fuel-1um

This is the consumable side of filtration separation. The 18-inch PE filter sock is rated at 1 micron, making it useful for extra-fine straining of water, ethanol, methanol, and oil. It is welded and sewn with a round bottom, and the 7-inch non-corrosive metal ring helps keep the bag open. The catch is that this is the filter media itself, not a housing. You need a bag filter vessel to hold it. If you want to add fine liquid filtration to an existing system, this sock is the entry point.

High Flow 5 Micron Industrial Air Filter with Auto Drain & Metal Bowl

High Flow 5 Micron Industrial Air Filter with Auto Drain & Metal Bowl

This unit is built for compressed air lines rather than liquid processes. It is a 5-micron particulate filter with an in-line water trap, a metal bowl, and an auto drain, and it uses a 3/4-inch NPT connection. The metal bowl and auto drain make it a practical choice for keeping water and debris out of air tools and compressor accessories. The limitation is its scope: it is for air-line systems, not for bag- or cartridge-style liquid filtration. It also has a 140°F maximum temperature rating, so it is not meant for high-heat process streams.

Final Recommendation by Use Case

  • For a permanent housing for liquid bag filtration: Filtra Systems FSC Bag Filter Housing.
  • For a fine-media consumable to try in an existing bag system: Industrial filter bag.
  • For protecting compressed air equipment: High Flow Industrial Air Filter.
  • For a lab-scale cartridge housing: Millipore Filter Housing SH011.
Products in this article
Filtra Systems FSC Bag Filter Housing 304 Stainless Steel 150 PSI IndustrialUSD 550.00View on eBayMillipore Filter Housing SH011 H2FBSH011T USED (Best OfferUSD 479.20View on eBayIndustrial filter bagUSD 19.99View on eBayHigh Flow 5 Micron Industrial Air FilterUSD 73.99View on eBay
Filtra Systems FSC Bag Filter Housing 304 Stainless Steel 150 PSI IndustrialUSD 550.00View on eBayMillipore Filter Housing SH011 H2FBSH011T USED (Best OfferUSD 479.20View on eBayIndustrial filter bagUSD 19.99View on eBayHigh Flow 5 Micron Industrial Air FilterUSD 73.99View on eBay

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