# High Efficiency Microfiber (BOS)

> Fil-Trek Bag Filters. Canonical page: https://www.fil-trek.com/products/bag-filters/bos

Category: Bag Filters
Series: BOS
Model format: `BOS-[MEDIA]-[MICRON]-[SIZE]-[FLANGE]`
Example: `BOS-3-PS`

## Overview
Absolute multilayer PO microfiber depth bag with silicone-free thermal bonding and a positive-seal collar provides long life and low dP in standard Size 2 housings

## How It Works
Fluid enters the housing and flows inside-to-outside through a basket-supported bag. The multilayer, graded-density PO microfiber depth media traps contaminants (and traces of oil), while a positive-seal collar minimizes bypass.

## Applications
- Coatings, paints, and inks: defect control and fine solids removal
- Water treatment and desalination: polishing and RO/UF pretreatment
- Chemicals, resins, and adhesives: clarification and gel/fines control
- Pulp & paper, power, electronics, marine, air/gas service: general liquid/utility filtration

## Physical Specifications
- **flow direction:** Inside-to-outside
- **outside diameter options:** 7.06"
- **nominal length options:** 32"
- **size options:** 2

## Media Specifications
- **media primary options:** Polypropylene
- **micron ratings:** 3, 5, 10, 25
- **efficiency percent:** 98%
- **media rating:** Absolute
- **beta ratio:** 50
- **changeout dp:** 15 PSID
- **burst pressure:** 35 PSID
- **max temperature:** 160°F
- **approvals certifications:** FDA Listed

## Housing Compatibility
- Fil-Trek BMB Series
- Fil-Trek LP Series
- Fil-Trek SL Series
- Fil-Trek PL Series
- Fil-Trek TL Series

## Competitor Cross-Reference
- AJR BOSA Series
- PALL (BOS/BOS MAX)

## Ordering
- Model format: `BOS-[MEDIA]-[MICRON]-[SIZE]-[FLANGE]`
- Examples:
  - `BOS-3-PS`
  - `BOS-10-PO`

### Media codes
- **PO:** Polypropylene

### Flange codes
- **PS:** POLYETHYLENE RING (STD)
- **SS:** STAINLESS STEEL RING
- **PO:** POLYPROPYLENE RING

### Size codes
- **2:** OD 7.06", length 32"

### Micron ratings
- 3, 5, 10, 25

## Contact
- **sales@fil-trek.com** — all filtration product inquiries, projects, filter housings, and filtration systems
- **filters@fil-trek.com** — replacement filter media, filter elements, filter bags, hardware, and spare parts

## Links
- HTML: https://www.fil-trek.com/products/bag-filters/bos
- Markdown: https://www.fil-trek.com/products/bag-filters/bos.md