Name: Unicel C-7451 Replacement Filter Cartridge | 50 sq. ft. | Caldera Spas
Brand: Unicel
SKU: C-7451
Price: 56.99 USD
Availability: InStock

Cylindrical pool filter cartridge with blue end caps and pleated white filter material, featuring a label with cartoon character

Cylindrical white pool or spa filter cartridge with blue plastic caps on both ends and a central white strap around pleated material

cylindrical blue plastic replacement filter cartridge with white pleated filter material and handle on top

close-up of a blue cylindrical replacement filter cartridge with pleated white filter material on a white background

$56.99

$9.99 flat shipping on orders under $100.

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SKU:: C-7451

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About This Item

The Unicel C-7451 is a precision-engineered 50 sq. ft. replacement filter cartridge built specifically for Caldera Spas. Featuring 200 pleats of 3 oz. Reemay 2033 polyester media and a 2" male slip fitting bottom connection, this cartridge delivers exact OEM-grade fit and long-lasting filtration performance — drop-in ready with no modifications required.

Specifications

Filter Area	50 sq. ft.
Length	10 3/4"
Outer Diameter	7"
Top Inner Diameter	N/A
Bottom Inner Diameter	N/A
Material	3 oz. Reemay 2033
Pleat Count	200
Top Cap: semi-circular handle	Bottom Cap: 2" male slip fitting

Note from Unicel: The Unicel C-7350 can also be used as a replacement in this application. The C-7350 is identical in size and filtration area but features an open bottom with lip seal instead of a 2" male slip fitting — verify your spa's bottom inlet connection type before ordering.

Fits into:

OEM Brand	Product Name	Part Number	Notes
Caldera Spas	—	33016	C-7350 can also be used as a replacement

(This is not an exhaustive list.)

Also known as: C7451

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.

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