Darlly 50256 Spa Filter Cartridge
Replaces Unicel C-5402 (discontinued)
Darlly 50256 is a 25 sq ft spa filter cartridge, 5-1/2" x 11-7/8". It replaces Unicel C-5402 (discontinued).
Specifications
| Darlly part number | 50256 |
|---|---|
| Outside diameter | 5-1/2" |
| Length | 11-7/8" |
| Top end cap | 1-15/16" Open w/ 12 concentric holes |
| Bottom end cap | 2-7/8" Open |
| Filter area | 25 sq ft |
| Type | Spa |
| Darlly description | ozone cartridge (Dimension One Spas) |
Cross-reference
| Brand | Part numbers Darlly 50256 replaces |
|---|---|
| Unicel | C-5402 (discontinued) |
Older or other numbers that also point to this cartridge (not confirmed by a second source): PDO25 (Pleatco), FC-3096 (Filbur).
Questions
- What is the Darlly replacement for Unicel C-5402?
- Darlly 50256 replaces Unicel C-5402. Both are 5-1/2" in diameter and about 11-7/8" long.
- What size is Darlly 50256?
- Darlly 50256 is 5-1/2" in outside diameter and 11-7/8" long, with 25 sq ft of filter area.
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.