Unicel 4CH-30 Replacement Spa Filter Cartridge – 30 Sq Ft (4-5/8″ OD x 11-7/8″ Length, 1-1/2″ MPT Bottom)
The Unicel 4CH-30 is a top-load spa filter cartridge designed for select hot tubs and spa filter canisters that use a 1-1/2″ male pipe thread (MPT) screw-in bottom connection and a molded cone handle on top for easy removal. With 30 sq ft of pleated filtration area, it helps capture fine debris for clearer water and more consistent circulation when rinsed and cleaned regularly.
Key Features
- 30 sq ft pleated filtration area for effective debris capture
- Top: molded cone handle (closed top) for quick removal
- Bottom: 1-1/2″ MPT threaded connection for a secure, screw-in fit
- Durable pleated media and rigid core built for repeated cleaning cycles
- Ideal replacement when pleats are torn, flattened, or the cartridge stays restrictive after cleaning
Specifications
- Part Number: 4CH-30
- Filtration Area: 30 sq ft
- Outside Diameter: 4-5/8″ (4.625″)
- Length: 11-7/8″ (11.875″)
- Top End Cap: Molded cone handle (closed)
- Bottom End Cap: 1-1/2″ male thread (MPT)
- Pleat Count: 158
Replaces / Cross References
- Filbur: FC-0141 / FC-0141M
- Pleatco: PTL25P4
- Sundance Spas: 6540-484
- Dimension One: 1561-14
- Saratoga Spas: 74407-98
- Darlly: 40301
- Baleen: AK-9005
Compatibility Notes
- This cartridge uses a threaded bottom (1-1/2″ MPT). If your current filter has a slip (non-threaded) fitting or a different thread size, you need a different cartridge.
- Always confirm fit by matching the OD, length, and bottom connection style to your existing filter.
When to Replace
- Flow is weak or the system struggles to maintain circulation even after cleaning
- Pleats are torn, frayed, flattened, or separating from the end caps
- The cartridge quickly plugs up again after rinsing
- End caps or threaded connection are cracked/warped and won’t seal properly
Related Products
- Spa Cartridge Filter Cleaner
- Cartridge Cleaning Wand
- Spa Water Test Strips
- Spa Fill / Hose Pre-Filters
- Spa Scale Remover
- Silicone O-Ring Lubricant (Pool/Spa)
Maintenance Tips
- Rinse the cartridge regularly (often weekly with heavy spa use) to prevent restriction and keep flow strong.
- 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.
- Let the cartridge dry after deep cleaning when possible—drying can help loosen fine debris for easier rinsing.
