What is the Darlly replacement for Unicel C-5326?

Darlly 51250 replaces Unicel C-5326. Both are 5-7/8" in diameter and about 6" long.

What size is Darlly 51250?

Darlly 51250 is 5-7/8" in outside diameter and 6" long, with 25 sq ft of filter area.

Darlly 51250 Filter Cartridge

Replaces Unicel C-5326 (discontinued)

Darlly 51250 is a 25 sq ft filter cartridge, 5-7/8" x 6". It replaces Unicel C-5326 (discontinued).

Specifications

Darlly part number	51250
Outside diameter	5-7/8"
Length	6"
Top end cap	semi-circular Handle
Bottom end cap	male slip fitting w/ MPT
Filter area	25 sq ft
Darlly description	Seasonmaster (Model 111 after 1994)

Cross-reference

Brand	Part numbers Darlly 51250 replaces
Unicel	C-5326 (discontinued)

Other Darlly cartridges the same size

Same diameter and length. Check the end caps and area before swapping.

Darlly 5025925 sq ft · Seasonmaster (Model 111 before 1994)

Questions

What is the Darlly replacement for Unicel C-5326?: Darlly 51250 replaces Unicel C-5326. Both are 5-7/8" in diameter and about 6" long.
What size is Darlly 51250?: Darlly 51250 is 5-7/8" in outside diameter and 6" long, with 25 sq ft of filter area.

Where to buy Darlly 51250

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 51250 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.