cylindrical pool filter cartridge with blue plastic ends and white pleated filtration fabric standing upright on white background
cylindrical replacement filter cartridge with blue plastic ends and white pleated filtering material
cylindrical white pleated spa filter cartridge with blue plastic circular end and central hollow opening
Close-up of a replacement filter cartridge end with a blue plastic cap and pleated white filter material extending from it

Unicel 5CH-352 Replacement Filter Cartridge | 35 sq. ft. | Marquis Spas

4.6 ★★★★ (172) ▾
Regular price$37.99
/
$9.99 flat shipping on orders under $100.
Unicel Authorized Dealer Full Manufacturer Warranty Support
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SKU:
5CH-352
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About This Item

The Unicel 5CH-352 is a 5000 Series 35 sq. ft. replacement filter cartridge engineered specifically for Marquis Spas top-load filtration systems. With 151 pleats of 3 oz. Reemay 2033 polyester media, this cartridge delivers thorough particulate capture and sustained water clarity between cleanings. The 2" MPT threaded bottom mount ensures a secure, leak-free connection to the filter standpipe.

⚠️ IMPORTANT: Many Marquis Spas Use a Dual-Filter System
Many Marquis Spas models include a second, smaller filter cartridge dedicated to the 24-hour circulation pump — in addition to this primary 35 sq. ft. filter. A complete filter service requires replacing both filters. Before ordering, count the cartridges currently installed in your spa to confirm the full quantity needed.

Specifications

Filter Area 35 sq. ft.
Length 12 1/2"
Outer Diameter 5 3/16"
Top Inner Diameter N/A
Bottom Inner Diameter N/A
Material 3 oz. Reemay 2033
Pleat Count 151
Top Cap: bar handle
Top Cap
Bottom Cap: 2" male thread/MPT
Bottom Cap

Fits into:

OEM Brand Product Name Part Number Notes
Marquis Spas 35 sq. ft. Top Load 20042
Marquis Spas 35 sq. ft. Top Load 370-0242
Marquis Spas 35 sq. ft. Top Load 370-0243
Marquis Spas 35 sq. ft. Top Load 20092
Marquis Spas 35 sq. ft. Top Load 370-0683
Marquis Spas 35 sq. ft. Top Load 370-0698
Marquis Spas 35 sq. ft. Top Load 370-0240

(This is not an exhaustive list.)

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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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