Darlly 81756 Pool Filter Cartridge
Replaces Unicel C-8417 · Pleatco PA175 (now ULTRA-B4) · Filbur FC-1294
- Diameter × length
- 8-15/16" × 28-3/16"
- Filter area
- 175 sq ft
- End caps
- 4" Open w/ molded gasket / 4" Open w/ molded gasket
- 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 81756 is a 175 sq ft pool filter cartridge, 8-15/16" x 28-3/16". It fits the Hayward Star-Clear Plus C1750 and the Waterway Pro-Clean 175. It replaces Unicel C-8417, Pleatco PA175 (now ULTRA-B4), Filbur FC-1294, Hayward CX1750RE and Waterway 817-0175P.
Specifications
| Darlly part number | 81756 |
|---|---|
| Outside diameter | 8-15/16" |
| Length | 28-3/16" |
| Top end cap | 4" Open w/ molded gasket |
| Bottom end cap | 4" Open w/ molded gasket |
| Filter area | 175 sq ft |
| Type | Pool |
| Darlly description | Hayward C1750RE, Hayward C1900RE, Waterway Pro Clean 175 |
Cross-reference
| Brand | Part numbers Darlly 81756 replaces |
|---|---|
| Unicel | C-8417 |
| Pleatco | PA175 (now ULTRA-B4), ULTRA-B4 |
| Filbur | FC-1294 |
| Hurricane (former brand) | HF8417-01 |
| OEM and other numbers | Hayward CX1750RE, Waterway 817-0175P |
Filters it fits
| Filter | Cartridges per filter | OEM cartridge number |
|---|---|---|
| Hayward Star-Clear Plus C1750 (175 sq ft filter) | 1 | CX1750RE |
| Waterway Pro-Clean 175 (175 sq ft filter) | 1 | 817-0175P |
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-8417?
- Darlly 81756 replaces Unicel C-8417. Both are 8-15/16" in diameter and about 28-3/16" long.
- What Darlly cartridge replaces Pleatco PA175?
- Darlly 81756 replaces Pleatco PA175, which Pleatco now sells as ULTRA-B4.
- What size is Darlly 81756?
- Darlly 81756 is 8-15/16" in outside diameter and 28-3/16" long, with 175 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.