Franklin 10" x 4.5" OD Spun Poly Filter Cartridge, NSF 42 Certified (FWPS Series)

NSF 42 Certified Melt Blown Sediment Filter for Big Blue Whole House and Commercial Systems

Overview

The Franklin FWPS Series is tested and certified by NSF International to NSF/ANSI 42 for material safety requirements and compliant with FDA CFR Title 21 for food-contact applications. Three-layer micro-denier melt blown polypropylene with no glues, binders, or adhesives. Rated to 150°F (65°C). Four micron ratings: 1, 5, 20, 50. Fits all standard 10 x 4.5 Big Blue housings.

Key Features of 10 x 4.5 Big Blue Sediment Filter Cartridges

• Three-layer gradient density captures coarse particles on the outer surface and progressively finer particles toward the center, which extends cartridge life and reduces the frequency of replacements.
• Micro-denier melt blown fiber achieves finer fiber diameters than standard-denier media, which increases the number of particle contact points per layer and improves capture efficiency without increasing pressure drop.
• 150°F (65°C) maximum operating temperature provides headroom above the 125°F limit of many commodity Big Blue cartridges and handles food processing and warm process water applications without approaching the cartridge's rated limit.
• 100% polypropylene construction resists chemical attack, bacterial growth, and does not add taste, color, or odor to the water.
• Thermal bonding fuses the fibers without binders or adhesives that could leach into the water or break down under pressure.
• NSF 42 tested and certified by NSF International for material safety requirements. FDA CFR Title 21 compliant for direct food-contact applications.

Specifications

*Flow rate varies by micron rating. Lower micron = lower max flow.

How Three-Layer Gradient Density Works

A standard 10 x 4.5 sediment filter cartridge uses fibers of one size throughout the cartridge. All particles, coarse and fine, hit the same media at once. The fine pores clog first, and the cartridge loads from the inside out.

The FWPS cartridge stacks three distinct fiber layers. The outer layer uses the largest fibers, which catch sand, rust, and coarse sediment before they reach the interior. The middle layer captures mid-range particles. The innermost layer uses the finest micro-denier fibers and handles the smallest sediment at the rated micron level. Each layer does a portion of the work, so no single layer bears the full load.

The result is higher total dirt-holding capacity and a more gradual pressure rise over time. The cartridge loads evenly from outside to inside instead of plugging at one depth. Replacement intervals are longer under the same water conditions compared to single-density cartridges with the same micron rating.

Compatible Systems

The Franklin FWPS 10" x 4.5" fits any standard Big Blue housing that accepts a 4.5" OD, 10" length cartridge. This is an industry-standard form factor shared across manufacturers:

Replaces These Cartridges

Franklin Water Treatment Canada now produces the former Waterite and Excelpure filter lines. The FWPS Big Blue cartridge is the direct replacement for former Excelpure and Waterite melt blown polypropylene cartridges with identical performance and specifications.

If your system uses a different brand of 10 x 4.5 sediment filter cartridge in melt blown polypropylene, the FWPS is a direct physical replacement. Match the micron rating to your current cartridge.

Applications

• Whole-house sediment filtration on municipal or well water
• Pre-filtration upstream of RO membranes to extend membrane life
• Commercial water treatment systems requiring NSF 42 documentation
• Food and beverage processing under FDA CFR Title 21 requirements
• Process water and chemical processing where polypropylene chemical resistance is needed
• Electroplating rinse water filtration
• Post-filtration for potable water polishing

Buy 10 x 4.5 Big Blue Sediment Filter Cartridges from Cleanflow

Cleanflow stocks the Franklin FWPS 10" x 4.5" melt blown sediment filter cartridge in all four micron ratings as part of the Franklin Water catalog, alongside string wound and dual gradient Big Blue cartridges, plus pleated and carbon block options in the Big Blue Water Filters collection. Available individually or by the case (12 filters). Need housing? Cleanflow carries Duplex and TriPlex Big Blue housing systems that accept this cartridge.

Free shipping on orders over $199. 30-day return policy at returns.cleanflow.net. Ships across Canada and the United States. Email info@cleanflow.ca for case pricing, volume orders, or help selecting the right micron rating.