cylindrical white replacement filter cartridge with blue ends and a label featuring a smiling cartoon filter character
cylindrical white pleated filter cartridge with blue caps on top and bottom for spa filtration
cylindrical pool or spa filter cartridge with blue plastic ends and pleated white filter material around the body
Cylindrical replacement filter cartridge with blue plastic ends and white pleated filter material in the middle

Unicel 8000 Series 100 sq. ft. Replacement Filter Cartridge for Caldera Spas | C-8399

Regular price$72.99
/
$9.99 flat shipping on orders under $100.
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SKU:
C-8399
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About This Item

The Unicel C-8399 is an 8000 Series 100 sq. ft. replacement filter cartridge engineered for Caldera Spas systems. With 259 precision-formed pleats of 3 oz. Reemay 2033 polyester media, this cartridge delivers the filtration surface area needed to maintain crisp, clear spa water — meeting OEM specifications without compromise.

Specifications

Filter Area 100 sq. ft.
Length 16 1/2"
Outer Diameter 8"
Top Inner Diameter N/A
Bottom Inner Diameter 3 5/8"
Material 3 oz. Reemay 2033
Pleat Count 259
Top Cap: semi-circular handle
Top Cap
Bottom Cap: open w/ lip seal
Bottom Cap

Fits into:

OEM Brand Product Name Part Number Notes
Caldera Spas 1039607
Caldera Spas 73722

(This is not an exhaustive list.)

Also known as: C8399

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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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