cylindrical white pool filter cartridge with blue top and bottom edges and barcode label marked C-4310
Cylindrical pool filter cartridge with white pleated material and blue plastic top and bottom edges on a plain background
cylindrical replacement filter cartridge with blue rubber ends and pleated white filter material in the middle
cylindrical water filter cartridge with pleated white filter material and blue plastic end caps shown from the front

Unicel 4000 Series 10 sq. ft. Replacement Filter Cartridge | C-4310

Regular price$18.99
/
$9.99 flat shipping on orders under $100.
Unicel Authorized Dealer Full Manufacturer Warranty Support
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SKU:
C-4310
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About This Item

The Unicel 4000 Series C-4310 is a 10 sq. ft. replacement filter cartridge engineered for compact skimmer and spa filtration systems. With 216 precision-pleated folds of 3 oz. Reemay 2033 polyester media, it delivers maximum surface area and water clarity in a small-footprint housing — a direct OEM-grade replacement backed by Unicel's industry-leading compatibility database.

Specifications

Filter Area 10 sq. ft.
Length 4"
Outer Diameter 4 1/4"
Top Inner Diameter 2 1/16"
Bottom Inner Diameter 2 1/16"
Material 3 oz. Reemay 2033
Pleat Count 216
Top Cap: open
Top Cap
Bottom Cap: open
Bottom Cap

Fits into:

OEM Brand Product Name Part Number Notes
Waterway Plastics Skim Filter 10 sq. ft. 817-0010
Custom Molded Products Front Access Skimmer 25249
Icon Spas 146949
Rec Warehouse 378900
Also compatible with select models from: Accent Spas, Blue Falls Mfg. Ltd. (Canada), Charisma Spas, Hollibaugh Spas, Leisure Bay Spas, PDC Spas, Sonoma Spas, Superior Spas, Thermo Spas of Connecticut, US Tooling & Spa

(This is not an exhaustive list.)

Also known as: C4310

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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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