What is the Darlly replacement for Unicel C-8415?

Darlly 81503 replaces Unicel C-8415. Both are 8-15/16" in diameter and about 24-7/16" long.

What Darlly cartridge replaces Pleatco PAST150?

Darlly 81503 replaces Pleatco PAST150.

What size is Darlly 81503?

Darlly 81503 is 8-15/16" in outside diameter and 24-7/16" long, with 150 sq ft of filter area.

Darlly 81503 Pool Filter Cartridge

Replaces Unicel C-8415 · Pleatco PAST150 (discontinued) · Filbur FC-0903

Darlly 81503 is a 150 sq ft pool filter cartridge, 8-15/16" x 24-7/16". It replaces Unicel C-8415, Pleatco PAST150 (discontinued) and Filbur FC-0903.

Specifications

Darlly part number	81503
Outside diameter	8-15/16"
Length	24-7/16"
Top end cap	3-3/4" Open
Bottom end cap	3-3/4" Open
Filter area	150 sq ft
Type	Pool
Darlly description	Astral 2515 CE Terra

Cross-reference

Brand	Part numbers Darlly 81503 replaces
Unicel	C-8415
Pleatco	PAST150 (discontinued)
Filbur	FC-0903

Questions

What is the Darlly replacement for Unicel C-8415?: Darlly 81503 replaces Unicel C-8415. Both are 8-15/16" in diameter and about 24-7/16" long.
What Darlly cartridge replaces Pleatco PAST150?: Darlly 81503 replaces Pleatco PAST150.
What size is Darlly 81503?: Darlly 81503 is 8-15/16" in outside diameter and 24-7/16" long, with 150 sq ft of filter area.

Where to buy Darlly 81503

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 Darlly 81503 on darllyfilter.com

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.