Liquid Filter Bags for Bag Filter Vessels

Typical liquid filter vessels are top loading, with a hinged or threaded lid. A metal restrainer basket sits inside the vessel and supports the filter bag under pressure. Liquid enters the open top of the bag, passes out through the filter media and leaves the vessel, while the solids collect inside the bag.

Because the dirt stays in the bag, a change out is quick: open the lid, lift out the loaded bag and drop in a new one. The ring or drawstring at the top of the bag seals against the vessel so liquid cannot bypass the filter media.

Industrial liquid bag filters handle high flow rates and heavy solids loading at a low cost, which makes them a common choice for process liquids, oil, water, coatings, chemicals, food and beverage, and as a pre-filter ahead of filter cartridges and reverse osmosis systems.

Need a new vessel? See our filter bag housings →

AFF felt bags are made from high quality needle felt liquid filtration media. Felt is a low cost depth filter material with high dirt holding capacity and long service life, and it is available in a wide range of materials. We carry polyester, polypropylene and Nomex felts in the 1 to 200 micron range.

Felt bags are offered in singed or glazed finishes to reduce fiber migration and downstream contamination. Choose a polyester felt liquid filter bag for general service, polypropylene felt for broad chemical compatibility in water and process liquids, or Nomex for higher temperature liquids.

AFF monofilament bags are made from precision woven monofilament fibers for accurate particle size retention. Nylon monofilament mesh is a common choice for paints, coatings and process water. Monofilaments are very strong and can be reused in most applications. Monofilament bags are offered in nylon and polyester from 5 to 1,200 micron.

Multifilament bags are woven from threads made of many filaments. They are a more economical option than monofilament bags. Particle retention is less precise, but they are very effective, and they are available in polyester from 75 to 1,200 micron.

The top of the bag is what seals it in the vessel. We offer plastic rings (often called flanges), plastic rings with integral handles, galvanized steel rings, stainless steel rings and drawstring tops, so every bag fits your vessel and your application.

Rings with handles make change outs faster and keep hands away from the dirty liquid. Steel and stainless steel rings hold their shape in demanding service, and drawstring tops fit open tanks and gravity systems.