Darlly 60301 Spa Filter Cartridge
Replaces Unicel C-6430 (discontinued) · Pleatco PWK30 (now ULTRA-S12) · Filbur FC-3915
- Diameter × length
- 6" × 10-1/2"
- Filter area
- 30 sq ft
- End caps
- 1-15/16" Open / 1-15/16" Open
- 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 60301 is a 30 sq ft spa filter cartridge, 6" x 10-1/2". It fits the Hot Spring 30 sq ft. It replaces Unicel C-6430 (discontinued), Pleatco PWK30 (now ULTRA-S12), Filbur FC-3915 and Hot Spring (Watkins) 31489.
Specifications
| Darlly part number | 60301 |
|---|---|
| Outside diameter | 6" |
| Length | 10-1/2" |
| Top end cap | 1-15/16" Open |
| Bottom end cap | 1-15/16" Open |
| Filter area | 30 sq ft |
| Type | Spa |
| Blue antimicrobial version | 60301M |
| Darlly description | Hot Springs Spas/Watkins Mfg. |
Cross-reference
| Brand | Part numbers Darlly 60301 replaces |
|---|---|
| Unicel | C-6430 (discontinued) |
| Pleatco | PWK30 (now ULTRA-S12), ULTRA-S12 |
| Filbur | FC-3915 |
| Hurricane (former brand) | HF6430-01 |
| OEM and other numbers | Hot Spring (Watkins) 31489 |
Filters it fits
| Filter | Cartridges per filter | OEM cartridge number |
|---|---|---|
| Hot Spring 30 sq ft (30 sq ft filter) | 1 | 31489 |
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-6430?
- Darlly 60301 replaces Unicel C-6430. Both are 6" in diameter and about 10-1/2" long.
- What Darlly cartridge replaces Pleatco PWK30?
- Darlly 60301 replaces Pleatco PWK30, which Pleatco now sells as ULTRA-S12.
- What size is Darlly 60301?
- Darlly 60301 is 6" in outside diameter and 10-1/2" long, with 30 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.