Tall cylindrical pool filter cartridge with blue caps on top and bottom and a detailed label with text and graphics wrapped around the center
Tall cylindrical pleated white filter cartridge with blue plastic caps on top and bottom on a clean white background
Cylindrical pool filter cartridge with white pleated fabric and blue plastic end cap labeled Unicel and Off showing locking tabs
cylindrical pool filter cartridge with a blue plastic top and pleated white filter material visible along the side

Unicel Replacement Filter Cartridge 30 sq. ft. | 4CH-30

4.8 ★★★★★ (12) ▾
Regular price$33.99
/
$9.99 flat shipping on orders under $100.
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SKU:
4CH-30
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About This Item

The Unicel 4000 Series 4CH-30 is a 30 sq. ft. replacement filter cartridge engineered for spa filtration systems with a 1-1/2" MPT bottom connection. With 158 precision pleats of heavy-duty 4 oz. Reemay 2040 polyester media, this cartridge delivers superior water clarity and extended service life compared to lighter-weight alternatives.

Specifications

Filter Area 30 sq. ft.
Length 11 7/8"
Outer Diameter 4 5/8"
Top Inner Diameter N/A
Bottom Inner Diameter N/A
Material 4 oz. Reemay 2040
Pleat Count 158
Top Cap: Molded cone handle
Top Cap
Bottom Cap: 1-1/2" male thread/MPT
Bottom Cap

Note from Unicel: This cartridge features a 1-1/2" threaded male fitting (MPT) on the bottom. It can also replace older filter styles that used a 1.9" opening with a separate, disposable adapter.

Fits into:

OEM Brand Product Name Part Number Notes
Blue Pacific Spas
Charisma Spas
Dimension One Spas 1561-14
Dolphin Spas
Florida Whirlpool
Freedom Spas Franklin, Statesman, Revere
Marathon Spas
OpuSpas
Saratoga Spas 74407-98
Seascape Spas

(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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