Unicel 6CH-961 Replacement Spa Filter Cartridge – 60 Sq Ft (Jacuzzi Premium J-300 / J-400 Style)
The Unicel 6CH-961 is a 60 sq ft pleated replacement spa filter cartridge commonly used in select Jacuzzi Premium spa systems (including many J-300 and J-400 series setups). It features a 6-3/4″ outside diameter body, a 15-1/2″ length, an open/slotted top, and a 2″ male SAE (coarse) threaded bottom connection for a secure, threaded fit in compatible filter canisters.
Key Features
- 60 sq ft filtration area for strong debris capture and clear water
- Bottom connection: 2″ male SAE coarse thread for secure installation
- Top: open/slotted style for proper flow-through design in compatible housings
- Durable pleated media and rigid core built for repeated rinsing and deep-clean cycles
- Ideal replacement when the original cartridge is torn, flattened, or no longer cleans up effectively
Specifications
- Part Number: 6CH-961
- Filtration Area: 60 sq ft
- Outside Diameter: 6-3/4″ (6.75″)
- Length: 15-1/2″ (15.5″)
- Top End: Open / slotted style
- Bottom End: 2″ male SAE thread (coarse)
Replaces / Cross References
- Jacuzzi Premium: 6541-383 (also commonly listed as 6540-383 depending on catalog)
- Pleatco: PJW60TL-OT-F2S
- Filbur: FC-2715
- Tier1: PAS-1342
Compatibility Notes
- This cartridge uses a threaded bottom connection (SAE coarse). If your existing filter has a slip fitting, different thread size, or a closed/handled top style, you may need a different cartridge.
- Some Jacuzzi-style canisters use an injection-molded top handle/cap piece that transfers from the old filter and is not included with the cartridge—confirm your current setup before ordering.
- Best practice: match the part number and confirm the 6-3/4″ OD, 15-1/2″ length, and 2″ male SAE threaded bottom.
When to Replace
- Water stays cloudy or circulation feels weak even after cleaning
- Pleats are torn, frayed, or separating from end caps
- Cartridge quickly plugs up again after rinsing
- End caps or threaded connection are cracked/warped and won’t seal properly
Related Products
- Unicel 6CH-961 (Shop / Options)
- Spa Cartridge Filter Cleaner
- Cartridge Cleaning Wand
- Spa Water Test Strips
- Spa Scale Remover
- Spa Fill / Hose Pre-Filters
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 with a cartridge cleaner to remove oils; rinse thoroughly before reinstalling.
- If scale is present, degrease first, then treat for scale (never reverse the order), and rinse completely.
- Rotating between two cartridges (one in use, one drying after cleaning) can extend overall filter life and improve filtration.
