# Mera Felt NSF 61 (MF61)

> Fil-Trek Bag Filters. Canonical page: https://www.fil-trek.com/products/bag-filters/mf61

Category: Bag Filters
Series: MF61
Model format: `MF61-[MEDIA]-[MICRON]-[SIZE]-[FLANGE]`
Example: `MF61-PO-10-2-PS`

## Overview
Nominal-rated, seamless polypropylene bag filters with NSF 61/FDA-compliant, silicone-free thermal bonding and a welded molded collar (or ring) to minimize bypass in critical prefiltration and polishing

## How It Works
Depth filtration traps particles within a needle-punched felt matrix with nominal efficiency

## Applications
- Potable and process water requiring NSF 61‑certified contact materials
- Chemical processing and batch cleanup with nominal retention needs
- Coatings, inks, and finishes sensitive to silicone and extractables
- Electronics, power, and general industrial high‑purity services
- Pulp and paper process streams and coating kitchens

## Physical Specifications
- **flow direction:** Inside-to-outside
- **outside diameter options:** 7.06"
- **nominal length options:** Depending on sizes
- **size options:** 1, 2

## Media Specifications
- **media primary options:** Polypropylene
- **micron ratings:** 3, 5, 10, 25, 35, 75, 100
- **efficiency percent:** 90%
- **media rating:** Nominal
- **beta ratio:** 50
- **changeout dp:** 15 PSID
- **burst pressure:** 35 PSID
- **max temperature:** 160°F
- **approvals certifications:** NSF 61, FDA Listed

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

## Ordering
- Model format: `MF61-[MEDIA]-[MICRON]-[SIZE]-[FLANGE]`
- Example: `MF61-PO-10-2-PS`

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

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

### Size codes
- **1:** OD 7.06", length 16.5"
- **2:** OD 7.06", length 32"

### Micron ratings
- 3, 5, 10, 25, 35, 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/mf61
- Markdown: https://www.fil-trek.com/products/bag-filters/mf61.md