Darlly 20035 Spa Filter Cartridge
Replaces Unicel C-2305 · Pleatco PSB3.5 (discontinued) · Filbur FC-3120
- Diameter × length
- 2-3/4" × 5-1/8"
- Filter area
- 3.5 sq ft
- End caps
- 1-1/16" Open / 1-1/16" 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 20035 is a 3.5 sq ft spa filter cartridge, 2-3/4" x 5-1/8". It replaces Unicel C-2305, Pleatco PSB3.5 (discontinued) and Filbur FC-3120.
Specifications
| Darlly part number | 20035 |
|---|---|
| Outside diameter | 2-3/4" |
| Length | 5-1/8" |
| Top end cap | 1-1/16" Open |
| Bottom end cap | 1-1/16" Open |
| Filter area | 3.5 sq ft |
| Type | Spa |
| Darlly description | Spa-In-A-Box |
Cross-reference
| Brand | Part numbers Darlly 20035 replaces |
|---|---|
| Unicel | C-2305 |
| Pleatco | PSB3.5 (discontinued) |
| Filbur | FC-3120 |
Questions
- What is the Darlly replacement for Unicel C-2305?
- Darlly 20035 replaces Unicel C-2305. Both are 2-3/4" in diameter and about 5-1/8" long.
- What Darlly cartridge replaces Pleatco PSB3.5?
- Darlly 20035 replaces Pleatco PSB3.5.
- What size is Darlly 20035?
- Darlly 20035 is 2-3/4" in outside diameter and 5-1/8" long, with 3.5 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.