Darlly 40451 Spa Filter Cartridge
Replaces Unicel C-4311 (discontinued) · Pleatco PDS45 (discontinued) · Filbur FC-2394
- Diameter × length
- 4-15/16" × 12-1/4"
- Filter area
- 45 sq ft
- End caps
- 2-1/8" Open / 2-1/8" Open
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.
Darlly 40451 is a 45 sq ft spa filter cartridge, 4-15/16" x 12-1/4". It replaces Unicel C-4311 (discontinued), Pleatco PDS45 (discontinued) and Filbur FC-2394.
Specifications
| Darlly part number | 40451 |
|---|---|
| Outside diameter | 4-15/16" |
| Length | 12-1/4" |
| Top end cap | 2-1/8" Open |
| Bottom end cap | 2-1/8" Open |
| Filter area | 45 sq ft |
| Type | Spa |
| Darlly description | spa filter |
Cross-reference
| Brand | Part numbers Darlly 40451 replaces |
|---|---|
| Unicel | C-4311 (discontinued) |
| Pleatco | PDS45 (discontinued) |
| Filbur | FC-2394 |
Questions
- What is the Darlly replacement for Unicel C-4311?
- Darlly 40451 replaces Unicel C-4311. Both are 4-15/16" in diameter and about 12-1/4" long.
- What Darlly cartridge replaces Pleatco PDS45?
- Darlly 40451 replaces Pleatco PDS45.
- What size is Darlly 40451?
- Darlly 40451 is 4-15/16" in outside diameter and 12-1/4" long, with 45 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.