Cylindrical pleated white pool filter cartridge with blue top and orange bottom edges and product label on front
Cylindrical pool filter cartridge with white pleated material, blue top, and red bottom against a white background
Cylindrical pool filter cartridge with blue plastic top and white pleated filter material inside
cylindrical replacement filter cartridge with pleated white filtering material and bright orange plastic end cap

Unicel UHD-SR50 Replacement Filter Cartridge 52 sq. ft. | Sta-Rite Posi-Flo 50

Regular price$65.99
/
$9.99 flat shipping on orders under $100.
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SKU:
UHD-SR50
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About This Item

The Unicel UHD-SR50 is a premium UHD Series replacement filter cartridge delivering 52 sq. ft. of heavy-duty filtration area for Sta-Rite Posi-Flo 50 pool and spa filter systems. Built with 4 oz. Reemay 2040 heavy-duty polyester filtration media — a full ounce heavier than standard 3 oz. cartridges — the UHD-SR50 delivers superior dirt-holding capacity, enhanced durability, and extended service intervals. With 195 precision-formed pleats maximizing media surface contact and a reinforced polypropylene core, this is the OEM-grade replacement your Posi-Flo 50 deserves.

Specifications

Filter Area 52 sq. ft.
Length 13 5/16"
Outer Diameter 8 11/16"
Top Inner Diameter 4 3/16"
Bottom Inner Diameter 4 3/16"
Material 4 oz. Reemay 2040
Pleat Count 195
Top Cap: open
Top Cap
Bottom Cap: open w/ 12 concentric slots
Bottom Cap

Note from Unicel: Replacement cartridge features a blue top end cap and orange bottom end cap.

Fits Into:

OEM Brand Product Name Part Number Notes
Sta-Rite Posi-Flo 50GPM-TX WC108-56S2X / 177007 WC108-56S2X = legacy Sta-Rite part; 177007 = current Pentair part
Sta-Rite Posi-Flo 50TX WC108-56S2X / 177007 WC108-56S2X = legacy Sta-Rite part; 177007 = current Pentair part
Sta-Rite Posi-Flo 50TXR WC108-56S2X / 177007 WC108-56S2X = legacy Sta-Rite part; 177007 = current Pentair part
Sta-Rite Posi-Flo T-50TX WC108-56S2X / 177007 WC108-56S2X = legacy Sta-Rite part; 177007 = current Pentair part
Sta-Rite Posi-Flo T-50TXR WC108-56S2X / 177007 WC108-56S2X = legacy Sta-Rite part; 177007 = current Pentair part
Sta-Rite Posi-Flo II PTM50 WC108-56S2X / 177007 WC108-56S2X = legacy Sta-Rite part; 177007 = current Pentair part

(This is not an exhaustive list.)

Also known as: UHDSR50

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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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