Unicel C-4326 25 Sq Ft Replacement Spa Filter Cartridge (2 Pack)

In this review the Unicel C-4326 cartridge pair is evaluated as a straightforward, dependable replacement for common pool and hot tub filtration needs. It is best for spa and pool owners who want a no-nonsense, affordable cartridge that restores clear water quickly. The single biggest reason to buy is the 25 sq ft of filter media spread across 106 pleats, which captures fine particulates down to about 20 microns while allowing good flow and easy cleaning.

Key Features

• 25 sq ft media: Provides substantial surface area to trap more debris and extend time between cleanings.
• 106 pleats: Sharp, uniform pleat folds maximize usable surface for dirt capture while minimizing pressure loss.
• Reemay polyester material: Durable, chemical-resistant media that balances dirt holding and cleanability for repeated use.
• Open end cap design: 2-1/8 in ID and rugged plastic end caps make removal and replacement simple and resist chemical damage.
• Compact dimensions: At 13-5/16 in length and 4-15/16 in OD the cartridge fits a wide range of compatible spa and pool housings.

Who It's For

The Unicel C-4326 is aimed at owners of hot tubs and smaller pools who need an economical, reliable filter replacement that restores filtration performance quickly. It suits users who perform regular monthly maintenance and want a cartridge that withstands repeated cleanings without rapid degradation.

Those who should look elsewhere include owners of very large commercial pools that require specialized high-flow or oversized cartridges, and buyers seeking a washable lifetime filter material beyond polyester Reemay construction.

Pros & Cons

Pros

• Effective capture of fine particles to roughly 20 microns, improving water clarity.
• Good value as a 2-pack that fits many common spa and pool brands and models.
• Durable Reemay polyester media resists chemical wear and cleans up easily.

Cons

• The cartridge must be cleaned regularly to maintain lifespan and performance; it is not a permanent, maintenance-free element.

Specifications

Our Verdict

The Unicel C-4326 2-pack is a practical, cost-effective replacement for many hot tubs and home pools, offering reliable filtration with easy maintenance. Owners who clean their cartridges regularly will find durable filter quality and a good balance of flow and debris capture, making it a sensible buy for household spa maintenance.

Frequently Asked Questions

Will this fit my spa?
It fits many common brands listed as compatible; check the 13-5/16 in length and 2-1/8 in ID to confirm fit.

How fine is the filtration?
The media captures particles down to about 20 microns on average.

How should I clean these?
Use a soft brush or filter cleaner and follow cleaning instructions; regular monthly maintenance preserves lifespan.