Polymicro Microfiber Seamless Filter Bags, BOS and BOS MAX

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Polymicro Filter Bag

Polymicro Microfiber Seamless Filter Bags, BOS and BOS MAX


The Polymicro seamless (BOS) filter bag is a hybrid, combining the best features of filter cartridges and conventional filter bags. The result is superior depth, pore gradient, and seamless construction. These seamless filter bags have exceptionally low tensile strength and provide superior resistance to channeling, unloading, bypass, and other forms of traditional leakage that result from pulsating water.

The innovative BOS MAX heavy duty seamless filter bags have an advanced design that provides extended life and increased efficiency, with a greater depth filtration than conventional filter bags.

Both filter bags have a durable multifilament mesh cover, which provides structural support, abrasion resistance, and facilitates installation and removal from the filter housing. A Polyloc® ring is sonically welded to the filter bags, providing a hermetic seal between the bag and the housing.


  • Seamless construction offers unequalled benefit of eliminating fluid bypass

  • Absolute rated 3-100 microns for highest efficiency and consistent quality

  • Microfiber-graded pore design provides longer service life, higher dirt load and lower initial pressure drop

  • Thermally-bonded microfibers contain no sizing, bonding adhesive, resin or silicone

  • FDA compliant

  • Can be incinerated for easy disposal

  • Designed for easy change-out to reduce down time

  • Silicone free to eliminate craters providing better surface results

  • Polyloc ring creates hermetic seal within a vessel housing to prevent liquid bypass

  • BOS MAX Heavy Duty Extended Life Bags contain a semi-rigid, graded density cartridge insert for up to four times the life of standard BOS bags and are ideal for high-purity applications


  • Seamless Construction

  • Plastic Polyloc Rings

  • Material : Polypropylene

  • Maximum Operating Temperature :200°F (93°C)

  • Sizes: 7 x 16 in. (17.8 x 40.65 cm) & 7 x 32 in. (17.8 x 81.3 cm)