Unicel 5CH-35 Spa Filter Cartridge – 35 Sq Ft (5-5/8″ OD x 8″ Length, Handle Top, 1-1/2″ MPT Bottom)
The Unicel 5CH-35 is a replacement 35 sq ft pleated spa filter cartridge designed for select hot tub and spa filtration systems that use a compact cartridge with a semi-circular handle on top and a 1-1/2″ male pipe thread (MPT) connection on the bottom. Replacing a worn cartridge helps restore circulation, improve water clarity, and reduce strain on spa pumps and heaters.
Key Features
- 35 sq ft filtration area for effective debris capture and steady spa flow
- Top: semi-circular handle for easy removal
- Bottom: 1-1/2″ MPT threaded connection for secure fit in compatible canisters
- 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: 5CH-35
- Filtration Area: 35 sq ft
- Outside Diameter: 5-5/8″ (5.625″)
- Length: 8″ (end cap to end cap)
- Top End Cap: Closed with semi-circular handle
- Bottom End Cap: 1-1/2″ male thread (MPT)
- Pleat Count: 203
- Media: 3 oz pleated media
Replaces / Cross References
- Pleatco: PAS35P4
- Pleatco (alternate reference): PMAX50P4
- Filbur: FC-0300
- Darlly: 50353
Compatibility Notes
- This cartridge uses a threaded bottom (1-1/2″ MPT). If your current filter has a slip fitting (non-threaded) bottom, you need a different model.
- Always confirm fit by matching the 5-5/8″ OD, 8″ length, handle top, and 1-1/2″ MPT bottom connection.
When to Replace
- Flow is weak or the spa struggles to maintain circulation even after cleaning
- Pleats are torn, frayed, flattened, or separating from 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
- Unicel 5CH-35 (Shop / Options)
- Spa Cartridge Filter Cleaner
- Cartridge Cleaning Wand
- Spa Fill / Hose Pre-Filters
- Spa Water Test Strips
- Silicone O-Ring Lubricant (Pool/Spa)
Maintenance Tips
- Rinse the cartridge regularly (often weekly with heavy 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.
- Rotating between two cartridges (one in use, one drying after cleaning) can extend overall filter life and improve filtration consistency.
