Darlly 70257 Pool Filter Cartridge
Replaces Unicel C-7427
- Diameter × length
- 7-1/4" × 9-7/8"
- Filter area
- 25 sq ft
- End caps
- 3-1/16" Open w/ step
- Per filter
- 1 cartridge
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 70257 is a 25 sq ft pool filter cartridge, 7-1/4" x 9-7/8". It fits the Waterco Trimline C-25. It replaces Unicel C-7427 and Waterco 62040.
Specifications
| Darlly part number | 70257 |
|---|---|
| Outside diameter | 7-1/4" |
| Length | 9-7/8" |
| Bottom end cap | 3-1/16" Open w/ step |
| Filter area | 25 sq ft |
| Type | Pool |
| Darlly description | Waterco |
Cross-reference
| Brand | Part numbers Darlly 70257 replaces |
|---|---|
| Unicel | C-7427 |
| OEM and other numbers | Waterco 62040 |
Older or other numbers that also point to this cartridge (not confirmed by a second source): PWC25 (Pleatco).
Filters it fits
| Filter | Cartridges per filter | OEM cartridge number |
|---|---|---|
| Waterco Trimline C-25 (25 sq ft filter) | 1 | 62040 |
Questions
- What is the Darlly replacement for Unicel C-7427?
- Darlly 70257 replaces Unicel C-7427. Both are 7-1/4" in diameter and about 9-7/8" long.
- What size is Darlly 70257?
- Darlly 70257 is 7-1/4" in outside diameter and 9-7/8" 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.