Cylindrical white pleated pool filter cartridge with blue end caps and a label featuring the Unicel logo and product details
Tall cylindrical filter cartridge with white pleated material and blue top and bottom edges standing vertically on white background
Cylindrical pool filter cartridge with white pleated material and blue end cap embossed with UNICEL and C-4625
Cylindrical replacement filter cartridge with white pleated material and blue plastic end cap shown front facing

Unicel 25 sq. ft. Replacement Filter Cartridge | C-4625

Regular price$36.99
/
$9.99 flat shipping on orders under $100.
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SKU:
C-4625
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About This Item

The Unicel C-4625 is a 4000 Series 25 sq. ft. replacement filter cartridge engineered to exact OEM dimensions for a precision fit. Built with 4 oz. Reemay 2040 — a heavier-weight filter media than the standard 3 oz. construction — this 106-pleat cartridge delivers superior dirt-holding capacity and extended service life between cleanings.

Specifications

Filter Area 25 sq. ft.
Length 13 5/16"
Outer Diameter 4 15/16"
Top Inner Diameter 2 1/8"
Bottom Inner Diameter 2 1/8"
Material 4 oz. Reemay 2040
Pleat Count 106
Top Cap: Open
Top Cap - Open
Bottom Cap: Open
Bottom Cap - Open

Fits into:

OEM Brand Product Name Part Number Notes
Pentair - Rainbow Plastics Dynamic Series 1 - Model RDC-25 25 sq. ft. model only
Pentair - Rainbow Plastics Dynamic Series II & III - RTL-25 / RCF-25 25 sq. ft. model only
Pentair - Rainbow Plastics Dynamic Series IV - DFM-25 / DFML-25 25 sq. ft. model only
Alps Spas
Aries Spas
Blue Pacific Spas
Esther Williams
Haughs
Heldor Spas
Hydro Pool Industries
J.E.M. Spas
Sequoia Design
Warm Springs Spa

(This is not an exhaustive list.)

Pro Tip: Before ordering, measure your existing cartridge: confirm 13 5/16" length and 4 15/16" outer diameter. Rainbow/Pentair Dynamic Series filters were produced in multiple square footage sizes — verify your housing is the 25 sq. ft. version (RDC-25, RTL-25, RCF-25, DFM-25, or DFML-25) to ensure a correct fit.

Also known as: C4625

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Unicel Filter Cartridges and DE Grids

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.

More about Pool and Spa Filter Cartridges

Complete Your Pool Care Routine

Essential Pairing
Filter Cleaning Chemicals for All Types of Pool & Spa Filters

Using a specialized cleaner like FilterWash helps release deeply embedded oils and minerals that standard rinsing leaves behind.

Shop Filter Cleaning Chemicals for All Types of Pool & Spa Filters
Highly Recommended
Pool and Spa Plumbing Lubricants

Every time you open your filter tank, you must lubricate the O-ring to prevent dangerous leaks and ensure a watertight seal.

Shop Pool and Spa Plumbing Lubricants
Pro Tip: Don't Forget
Pool Test Kits and Water Analysis Tools

Balanced water pH prevents calcium scale from hardening your filter fabric and ruining your new cartridges.

Shop Pool Test Kits and Water Analysis Tools

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