# Dual Flow Welded (DF)

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

Category: Bag Filters
Series: DF
Model format: `DF-[MEDIA]-[MICRON]-[SIZE]-[FLANGE]`
Example: `DF-PO-2-PF`

## Overview
Dual-cylinder, welded-seam bag boosts area to lower dP and hold-up, with a positive-seal fit for standard baskets; choose PP or PE felt per chemistry, temperature, and compliance needs

## How It Works
Inside-to-outside flow through a basket-supported bag. Dual Flow inner/outer cylinders split flow to increase area and lower face velocity/hold-up volume; depth felt captures particles.

## Applications
- Paints, coatings, inks: fines/gel removal and defect control
- Chemicals, resins, adhesives: clarification and particulate control
- Coolants, lubricants, parts‑wash fluids: solids/haze reduction
- Water treatment and RO/UF pretreatment; general plant liquids
- Food and beverage polishing (verify compliance)

## Physical Specifications
- **flow direction:** Inside-to-outside
- **outside diameter options:** 6.625"
- **nominal length options:** Depending on size
- **size options:** 1, 2

## Media Specifications
- **media primary options:** Polypropylene, Polyester
- **micron ratings:** 1, 5, 10, 25, 35, 50, 75, 100
- **efficiency percent:** 95%
- **media rating:** Nominal
- **beta ratio:** 20
- **changeout dp:** 15 PSID
- **burst pressure:** 35 PSID
- **max temperature:** 200°F (Polypropylene), 275°F (Polyester)
- **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 DF Series
- Rosedale X-tend Series

## Ordering
- Model format: `DF-[MEDIA]-[MICRON]-[SIZE]-[FLANGE]`
- Examples:
  - `DF-PO-2-PF`
  - `DF-PE-1-PS`

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

### Flange codes
- **PF:** F STYLE FLANGE
- **PS:** PLASTIC SURE SEAL

### Size codes
- **1:** OD 6.625", length 12"
- **2:** OD 6.625", length 26"

### Micron ratings
- 1, 5, 10, 25, 35, 50, 75, 100

## 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/df
- Markdown: https://www.fil-trek.com/products/bag-filters/df.md