What is the Darlly replacement for Unicel C-4312?

Darlly 40122 replaces Unicel C-4312, which Unicel now sells as C-4325. Both are 4-5/8" in diameter and about 11-7/8" long.

What Darlly cartridge replaces Pleatco PA12?

Darlly 40122 replaces Pleatco PA12, which Pleatco now sells as ULTRA-D7.

What size is Darlly 40122?

Darlly 40122 is 4-5/8" in outside diameter and 11-7/8" long, with 12 sq ft of filter area.

Darlly 40122 Pool Filter Cartridge

Replaces Unicel C-4312 (now C-4325) · Pleatco PA12 (now ULTRA-D7) · Filbur FC-1210

Darlly 40122 is a 12 sq ft pool filter cartridge, 4-5/8" x 11-7/8". It replaces Unicel C-4312 (now C-4325), Pleatco PA12 (now ULTRA-D7) and Filbur FC-1210.

Specifications

Darlly part number	40122
Outside diameter	4-5/8"
Length	11-7/8"
Top end cap	2-1/16" Open
Bottom end cap	2-1/16" Open
Filter area	12 sq ft
Type	Pool
Darlly description	Hayward C120RE

Cross-reference

Brand	Part numbers Darlly 40122 replaces
Unicel	C-4312 (now C-4325)
Pleatco	PA12 (now ULTRA-D7), ULTRA-D7
Filbur	FC-1210

Other Darlly cartridges the same size

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

Darlly 4020320 sq ft · Hayward MicroStar-Clear C200 (in-line); American…Darlly 4025425 sq ft · Hayward MicroStar-Clear C225 (in-line); American…Darlly 4020420 sq ft · American Commander II (in-line)Darlly 4030130 sq ft · top load

Questions

What is the Darlly replacement for Unicel C-4312?: Darlly 40122 replaces Unicel C-4312, which Unicel now sells as C-4325. Both are 4-5/8" in diameter and about 11-7/8" long.
What Darlly cartridge replaces Pleatco PA12?: Darlly 40122 replaces Pleatco PA12, which Pleatco now sells as ULTRA-D7.
What size is Darlly 40122?: Darlly 40122 is 4-5/8" in outside diameter and 11-7/8" long, with 12 sq ft of filter area.

Where to buy Darlly 40122

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 40122 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.