# Internal Pleated (ESP)

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

Category: Bag Filters
Series: ESP
Model format: `ESP-[MEDIA]-[MICRON]-[FLANGE]`
Example: `ESP-PO-5-PS`

## Overview
Nominal internal-pleat bag (dual pleats with felt wrap), silicone-free and thermally bonded, with a positive-seal collar to boost area, cut face velocity/dP, and extend life in P2 housings

## How It Works
Inside-to-outside flow through a basket-supported bag. Two internal pleated layers (prefilter + final) followed by an outer felt wrap increase area and reduce face velocity for long life at nominal efficiency.

## Applications
- Coatings, paints, inks: fines/gel removal and defect control
- Chemicals, resins, adhesives: clarification and particulate reduction
- Water and wastewater: polishing and RO/UF pretreatment
- Coolants, lubricants, parts-wash fluids: solids and haze control
- General plant liquids and hydrocarbon process streams

## 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, Polyester
- **micron ratings:** 1, 5, 10, 25, 50, 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 ESP Series

## Ordering
- Model format: `ESP-[MEDIA]-[MICRON]-[FLANGE]`
- Examples:
  - `ESP-PO-5-PS`
  - `ESP-PE-1-SS`

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

### Flange codes
- **PS:** PLASTIC SURE SEAL (STD)
- **CS:** GALVANIZED STEEL RING
- **SS:** STAINLESS STEEL RING

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

### Micron ratings
- 1, 5, 10, 25, 50, 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/esp
- Markdown: https://www.fil-trek.com/products/bag-filters/esp.md