Cylindrical white pool filter cartridge with blue edges and a label featuring a cartoon filter character and product details
cylindrical white pool filter cartridge with fine pleated material and blue plastic caps on top and bottom
cylindrical white filter cartridge with fine pleated surface and solid blue plastic end cap placed on white surface
cylindrical white pleated filter cartridge with bright blue plastic end cap marked unicel and c8325 on white background

Unicel 8000 Series 125 sq. ft. Replacement Filter Cartridge | C-8325

Regular price$87.99
/
$9.99 flat shipping on orders under $100.
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SKU:
C-8325
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About This Item

The Unicel C-8325 is the 8000 Series 125 sq. ft. replacement filter cartridge engineered for Sundance Spas Universal Length filtration systems. Built with 201 pleats of 3 oz. Reemay 2033 spun-bond polyester media, it delivers consistent water clarity and long-lasting filtration performance through regular spa use cycles.

⚠️ IMPORTANT: Length Measurement Note
The 18" length for this cartridge is measured to the first step of the top cap. This cartridge is the correct replacement for Sundance filters with an overall length of 18" to 18-1/2". Measure your existing cartridge before ordering to confirm fitment.

Specifications

Filter Area 125 sq. ft.
Length 18" (measured to first step)
Outer Diameter 8 7/16"
Top Inner Diameter N/A
Bottom Inner Diameter 2 1/2"
Material 3 oz. Reemay 2033
Pleat Count 201
Top Cap: closed w/ 3-step edge
Top Cap
Bottom Cap: open w/ beveled edge
Bottom Cap

Note from Unicel: Length recorded is measured to first step. Replacement for 18" to 18-1/2" overall length.

Fits into:

OEM Brand Product Name Part Number Notes
Sundance Spas Universal Length 6540-490 Length measured to first step. Replacement for 18" to 18-1/2" overall length.

(This is not an exhaustive list.)

Also known as: C8325

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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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