Unicel C-5397 Replacement Spa Filter Cartridge – 35 Sq Ft (Sundance / Jacuzzi Style)
The Unicel C-5397 is a premium 35 sq ft pleated spa filter cartridge commonly used in select Sundance / Jacuzzi spa filtration systems. It’s designed to restore proper circulation and water clarity when your existing cartridge is worn, torn, or no longer cleans effectively after cleaning cycles.
Key Features
- 35 sq ft filtration area for strong debris capture and steady spa circulation
- Durable pleated media and rigid core built for repeated rinsing and deep-cleaning
- Common service replacement for spas that use this cartridge size and end-cap style
- Helps reduce cloudiness and improves overall filtration efficiency when replaced on schedule
Specifications
- Part Number: C-5397
- Filtration Area: 35 sq ft
- Outside Diameter: 5″
- Length: 13-5/16″
- Top End Cap: Open
- Top Inside Diameter: 2-1/8″
- Bottom End Cap: Open
- Bottom Inside Diameter: 2-1/8″
Replaces / Cross References
- Pleatco: PJW35
- Filbur: FC-2976
- Sundance / Jacuzzi: 6540-488, 6540-501 (verify by measurements and end-cap style)
- Other common references: Darlly 50351, Aladdin 14511, Excel XLS-351, Spa-Daddy SD-00173
When to Replace
- Pleats are torn, frayed, or separating from end caps
- Cartridge stays restrictive even after a deep clean and thorough rinse
- Water stays cloudy despite balanced chemistry and routine maintenance
- End caps are cracked/warped or the core is collapsing
Related Products
- Unicel C-5397 (Shop / Options)
- Pleatco PJW35 (Alternate)
- Filbur FC-2976 (Alternate)
- Spa Cartridge Filter Cleaner
- Cartridge Cleaning Wands
- Spa Water Test Strips
Maintenance Tips
- Rinse filters frequently (weekly for heavy use) to prevent restriction and keep jets performing well.
- Deep clean every 3–6 weeks using a cartridge cleaner to remove oils; rinse thoroughly before reinstalling.
- If scale is present, degrease first, then treat for scale; rinse completely before returning to service.
- Rotating between two cartridges can extend filter life and improve overall filtration performance.
