What is the Darlly replacement for Unicel C-5615?

Darlly 50151 replaces Unicel C-5615, which Unicel now sells as C-5635. Both are 5" in diameter and about 13-5/16" long.

What size is Darlly 50151?

Darlly 50151 is 5" in outside diameter and 13-5/16" long, with 15 sq ft of filter area.

Darlly 50151 Spa Filter Cartridge

Replaces Unicel C-5615 (now C-5635) · Pleatco PJ15-IN-4 (set of 4) · Filbur FC-1415

Darlly 50151 is a 15 sq ft spa filter cartridge, 5" x 13-5/16". It replaces Unicel C-5615 (now C-5635), Pleatco PJ15-IN-4 (set of 4) and Filbur FC-1415.

Specifications

Darlly part number	50151
Outside diameter	5"
Length	13-5/16"
Top end cap	2-3/8" Open
Bottom end cap	2-3/8" Open
Filter area	15 sq ft
Type	Spa
Darlly description	Jacuzzi CFR-15 (in-line)

Cross-reference

Brand	Part numbers Darlly 50151 replaces
Unicel	C-5615 (now C-5635)
Pleatco	PJ15-IN-4 (set of 4)
Filbur	FC-1415

Other Darlly cartridges the same size

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

Darlly 5025125 sq ft · Jacuzzi CFR-25(in-line)Darlly 5037137 sq ft · Jacuzzi CFR-37(in-line)

Questions

What is the Darlly replacement for Unicel C-5615?: Darlly 50151 replaces Unicel C-5615, which Unicel now sells as C-5635. Both are 5" in diameter and about 13-5/16" long.
What size is Darlly 50151?: Darlly 50151 is 5" in outside diameter and 13-5/16" long, with 15 sq ft of filter area.

Where to buy Darlly 50151

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 50151 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.