cylindrical pleated pool filter cartridge with blue caps on both ends and white body with multiple labels including a cartoon filter character
Cylindrical pleated white filter cartridge with blue end caps and a central zip tie on a plain background
Cylinder shaped pool or spa filter cartridge with blue end caps and pleated white filtering material
Cylindrical pool filter cartridge with white pleated material and bright blue end caps against a white background

Unicel C-4305 Replacement Filter Cartridge | 50 sq. ft. | Cal Spas / Sundance / Sonfarrel

Regular price$47.99
/
$9.99 flat shipping on orders under $100.
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SKU:
C-4305
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About This Item

The Unicel C-4305 is a 4000 Series 50 sq. ft. replacement filter cartridge engineered for spa filtration systems requiring a compact, high-pleat-count cartridge. With 193 precision-folded pleats of 3 oz. Reemay 2033 polyester media, this cartridge delivers exceptional surface area in a 14 7/8" profile — trapping fine debris and maintaining water clarity between cleanings. Open top and bottom caps allow for straightforward installation into compatible spa filter housings.

Specifications

Filter Area 50 sq. ft.
Length 14 7/8"
Outer Diameter 4 15/16"
Top Inner Diameter 2 1/8"
Bottom Inner Diameter 2 1/8"
Material 3 oz. Reemay 2033
Pleat Count 193
Top Cap: open
Top Cap
Bottom Cap: open
Bottom Cap

Fits into:

OEM Brand Product Name Part Number Notes
Advantage Mfg.
Cal Spas
Dolphin Spas
Pageant Spas
Sonfarrel 220142
Sonfarrel 220145
Sonfarrel 220152
Sonfarrel 220175
Sundance Spas 6540-497

(This is not an exhaustive list.)

Also known as: C4305

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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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