What is the Darlly replacement for Unicel C-9441?

Darlly 11503 replaces Unicel C-9441. Both are 10-1/8" in diameter and about 23-1/8" long.

What Darlly cartridge replaces Pleatco PA150S?

Darlly 11503 replaces Pleatco PA150S, which Pleatco now sells as ULTRA-D4.

What size is Darlly 11503?

Darlly 11503 is 10-1/8" in outside diameter and 23-1/8" long, with 166 sq ft of filter area.

Darlly 11503 Pool Filter Cartridge

Replaces Unicel C-9441 · Pleatco PA150S (now ULTRA-D4) · Filbur FC-1266

Darlly 11503 is a 166 sq ft pool filter cartridge, 10-1/8" x 23-1/8". It fits the Hayward SwimClear Single Element C150S. It replaces Unicel C-9441, Pleatco PA150S (now ULTRA-D4), Filbur FC-1266 and Hayward CX150XRE.

Specifications

Darlly part number	11503
Outside diameter	10-1/8"
Length	23-1/8"
Filter area	166 sq ft
Type	Pool
Darlly description	Hayward CX150XRE

Cross-reference

Brand	Part numbers Darlly 11503 replaces
Unicel	C-9441
Pleatco	PA150S (now ULTRA-D4), ULTRA-D4
Filbur	FC-1266
Hurricane (former brand)	HF9441-01
OEM and other numbers	Hayward CX150XRE

Filters it fits

Filter	Cartridges per filter	OEM cartridge number
Hayward SwimClear Single Element C150S (150 sq ft filter)	1	CX150XRE

Unicel also lists its smaller C-8414 (8-15/16" OD; Darlly 81502 is that size) for the Hayward C150S, with the core support removed.

Questions

What is the Darlly replacement for Unicel C-9441?: Darlly 11503 replaces Unicel C-9441. Both are 10-1/8" in diameter and about 23-1/8" long.
What Darlly cartridge replaces Pleatco PA150S?: Darlly 11503 replaces Pleatco PA150S, which Pleatco now sells as ULTRA-D4.
What size is Darlly 11503?: Darlly 11503 is 10-1/8" in outside diameter and 23-1/8" long, with 166 sq ft of filter area.

Where to buy Darlly 11503

Pool and spa businesses in Florida, Georgia, South Carolina, Alabama, Mississippi, Louisiana and Texas order through their Grit Game rep. Everywhere else, contact Darlly Filtration directly.

Find your Grit Game rep Contact Darlly

Cross-reference checked October 21, 2026 against Unicel's 2026 Replacement Guide, Pleatco's catalog (updated September 2025), filbur.com and darllyfilter.com. A competitor number is listed only when that brand's own data pairs it with the same cartridge size. Always compare the size and end caps of your old cartridge before ordering.

Brand names and part numbers are trademarks of their respective owners and are shown only to identify compatible replacements. Darlly Filtration is not affiliated with or endorsed by them. Cross-reference by The Grit Game, Darlly's sales agency.