Name: Unicel Replacement Filter Cartridge 25 sq. ft. | Freeflow Spas CLX | 4CH-23
Brand: Unicel
SKU: 4CH-23
Price: 35.99 USD
Availability: InStock

cylindrical spa filter with blue plastic ends and pleated white material wrapped in clear plastic

cylindrical replacement filter cartridge with white pleated material and blue plastic threaded end caps on white background

cylindrical replacement pool filter cartridge with white pleated material and blue plastic caps on ends

cylindrical pool filter cartridge with blue plastic end cap embossed with UNICEL and model 4CH-23 on pleated white filter material

$35.99

$9.99 flat shipping on orders under $100.

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SKU:: 4CH-23

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About This Item

The Unicel 4CH-23 is a 25 sq. ft. replacement filter cartridge precision-engineered for Freeflow Spas CLX systems. With 212 pleats of 3 oz. Reemay 2033 spunbond polyester media packed into a compact 6 5/8" length, it delivers consistent water clarity and reliable flow in top-load spa filter housings. The closed top and 1-1/2" MPT bottom ensure a secure, leak-free fit with no adapters required.

Specifications

Filter Area	25 sq. ft.
Length	6 5/8"
Outer Diameter	4 15/16"
Top Inner Diameter	N/A
Bottom Inner Diameter	N/A
Material	3 oz. Reemay 2033
Pleat Count	212
Top Cap: closed	Bottom Cap: 1-1/2" male thread/MPT

Fits into:

OEM Brand	Product Name	Part Number	Notes
Freeflow Spas	CLX	303279	Closed top; single-cartridge system
Also replaces: Pleatco PFF25P4 • Filbur FC-3015

(This is not an exhaustive list.)

About Unicel Filter Cartridges and DE Grids

The "Gold Standard" of Replacement Cartridges
For over 50 years, Unicel (Meissner Mfg.) has been the professional's choice for restoring pool water clarity. While generic "knock-off" filters often use cheap, fuzzy fabric that clogs quickly, Unicel uses genuine Reemay® Filtration Media. This patented synthetic fiber features a unique trilobal shape that traps significantly more dirt and oils without choking your pump's water flow. Based in California, Unicel doesn't just copy filter dimensions; they engineer them to strict Original Equipment Manufacturer (OEM) specifications. This ensures a "lock-tight" fit in your filter tank, preventing debris from bypassing the system and returning to your pool.

Why We Trust Unicel Filter Cartridges and DE Grids: Genuine Reemay® Media: Uses continuous trilobal fibers to capture microscopic debris without restricting water flow.

Precision "Exact Fit": Engineered to match your tank's original specifications for a 100% leak-free seal.

Made in the USA: Manufactured in California with heavy-duty urethane end caps that resist cracking under pressure.

Longer Lifespan: Sharp, rigid pleats resist collapsing during cleaning, meaning you buy fewer replacements over time.

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