Unicel C-4332 Replacement Spa Filter Cartridge – 32 Sq Ft (Open Top & Bottom, 2-1/8″ ID)
The Unicel C-4332 is a premium 32 sq ft pleated replacement filter cartridge used in select hot tub and spa filtration systems that take a compact cartridge with open ends. It’s designed to capture fine debris while maintaining strong circulation, helping improve water clarity when rinsed and cleaned on a regular schedule.
Key Features
- 32 sq ft filtration area for effective debris capture and steady flow
- Open top & open bottom end caps for standpipe-style housings
- Durable pleated media built for repeated cleaning cycles
- Direct replacement when matched by part number and measurements
Specifications
- Part Number: C-4332
- Filtration Area: 32 sq ft
- Outside Diameter: 4-15/16″
- Length: 11-7/8″
- Top: Open
- Top Inside Diameter: 2-1/8″
- Bottom: Open
- Bottom Inside Diameter: 2-1/8″
- Pleat Count: 154
- Filter Media: 3 oz pleated media
Replaces / Cross References
- Pleatco: PMT25 (some applications also reference PMT35)
- Filbur: FC-1620 (some listings also reference FC-1612)
- Other common references: Martec SC-2200, Martec SC-3500, Sonfarrel 220022 / 30-220032
When to Replace
- Pleats are torn, frayed, or separating from the end caps
- Filter remains restrictive even after a deep clean and thorough rinse
- Water stays cloudy despite balanced chemistry and normal sanitizer levels
- End caps are cracked/warped or the inner core is weakening
Related Products
- Unicel C-4332 (Shop / Options)
- Spa Cartridge Filter Cleaner
- Cartridge Cleaning Wand
- Spa Water Test Strips
- Silicone O-Ring Lubricant (Pool/Spa)
Maintenance Tips
- Rinse the cartridge regularly (often weekly with heavy spa 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, and rinse completely before returning to service.
- Consider rotating between two cartridges (one in use, one drying after cleaning) to extend overall filter life.
