Darlly 71121 Pool Filter Cartridge
Replaces Unicel C-7489 · Pleatco PA112 (now ULTRA-A1) · Filbur FC-1275
- Diameter × length
- 7" × 25-1/2"
- Filter area
- 112 sq ft
- End caps
- 3" Open w/ molded gasket / 3" Open w/ molded gasket
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 71121 is a 112 sq ft pool filter cartridge, 7" x 25-1/2". It fits the Hayward Super-Star-Clear C4500 and SwimClear C4520, which take 4 cartridges each. It replaces Unicel C-7489, Pleatco PA112 (now ULTRA-A1), Filbur FC-1275, Hayward CX875RE and Hayward CX875XRE.
Specifications
| Darlly part number | 71121 |
|---|---|
| Outside diameter | 7" |
| Length | 25-1/2" |
| Top end cap | 3" Open w/ molded gasket |
| Bottom end cap | 3" Open w/ molded gasket |
| Filter area | 112 sq ft |
| Type | Pool |
| Cartridges per filter | 4 |
| Darlly description | Hayward CX875RE |
Cross-reference
| Brand | Part numbers Darlly 71121 replaces |
|---|---|
| Unicel | C-7489 |
| Pleatco | PA112 (now ULTRA-A1), ULTRA-A1 |
| Filbur | FC-1275 |
| Hurricane (former brand) | HF7489-04 |
| OEM and other numbers | Hayward CX875RE, Hayward CX875XRE |
Filters it fits
| Filter | Cartridges per filter | OEM cartridge number |
|---|---|---|
| Hayward Super-Star-Clear C4500; SwimClear C4520 (450 sq ft filter) | 4 | CX875RE, CX875XRE |
Same size as 71061 but 112 sq ft. Not the C4030 cartridge.
Also made as PP71121, the same size.
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-7489?
- Darlly 71121 replaces Unicel C-7489. Both are 7" in diameter and about 25-1/2" long.
- What Darlly cartridge replaces Pleatco PA112?
- Darlly 71121 replaces Pleatco PA112, which Pleatco now sells as ULTRA-A1.
- How many cartridges does the Hayward Super-Star-Clear C4500 use?
- It takes 4 cartridges. Order 4 of Darlly 71121 to replace the full set.
- What size is Darlly 71121?
- Darlly 71121 is 7" in outside diameter and 25-1/2" long, with 112 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.