Darlly 81257 Spa Filter Cartridge
Replaces Unicel C-8327
Darlly 81257 is a 125 sq ft spa filter cartridge, 8-7/16" x 19". It fits the Sundance Spas Without Divider. It replaces Unicel C-8327.
Specifications
| Darlly part number | 81257 |
|---|---|
| Outside diameter | 8-7/16" |
| Length | 19" |
| Top end cap | 1-1/2" male slip fitting |
| Bottom end cap | 2-1/2" Open w/ beveled edge |
| Filter area | 125 sq ft |
| Type | Spa |
| Blue antimicrobial version | 81257M |
| Darlly description | Sundance Spas Without Divider |
Cross-reference
| Brand | Part numbers Darlly 81257 replaces |
|---|---|
| Unicel | C-8327 |
Filters it fits
| Filter | Cartridges per filter |
|---|---|
| Sundance Spas Without Divider | 1 |
Other Darlly cartridges the same size
Same diameter and length. Check the end caps and area before swapping.
Questions
- What is the Darlly replacement for Unicel C-8327?
- Darlly 81257 replaces Unicel C-8327. Both are 8-7/16" in diameter and about 19" long.
- What size is Darlly 81257?
- Darlly 81257 is 8-7/16" in outside diameter and 19" long, with 125 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.