Darlly 71503 Pool Filter Cartridge
Replaces Unicel C-7697
- Diameter × length
- 7-1/2" × 29-1/16"
- Filter area
- 155 sq ft
- End caps
- 3-1/2" female thread/FPT / 2-5/8" Open
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 71503 is a 155 sq ft pool filter cartridge, 7-1/2" x 29-1/16". It replaces Unicel C-7697.
Specifications
| Darlly part number | 71503 |
|---|---|
| Outside diameter | 7-1/2" |
| Length | 29-1/16" |
| Top end cap | 3-1/2" female thread/FPT |
| Bottom end cap | 2-5/8" Open |
| Filter area | 155 sq ft |
| Type | Pool |
| Darlly description | Harmsco SC/TC 155 |
Cross-reference
| Brand | Part numbers Darlly 71503 replaces |
|---|---|
| Unicel | C-7697 |
Questions
- What is the Darlly replacement for Unicel C-7697?
- Darlly 71503 replaces Unicel C-7697. Both are 7-1/2" in diameter and about 29-1/16" long.
- What size is Darlly 71503?
- Darlly 71503 is 7-1/2" in outside diameter and 29-1/16" long, with 155 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.