Unicel 7CH-552 Replacement Spa Filter Cartridge – 52 Sq Ft (7″ OD x 10-1/2″ Length, Handle Top, 2″ MPT Bottom)
The Unicel 7CH-552 is a replacement pleated spa filter cartridge commonly used in select Dimension One (D1) “top load” style filter canisters. It features a top handle for easy removal and a 2″ male pipe thread (MPT) connection on the bottom for a secure, threaded fit in compatible housings. Replacing a worn cartridge helps restore circulation, improve water clarity, and reduce strain on spa pumps and heaters.
Key Features
- Nominal filtration area: 52 sq ft (often listed in the 52–55 sq ft class depending on catalog)
- Top: handle for quick removal during cleaning
- Bottom: 2″ MPT threaded connection for proper seating/sealing
- Durable pleated media designed for repeated rinse and deep-clean cycles
- Direct-fit replacement when matched by part number and dimensions
Specifications
- Part Number: 7CH-552
- Outside Diameter: 7″
- Length: 10-1/2″
- Top End Cap: Handle (closed)
- Bottom End Cap: 2″ Male Pipe Thread (MPT)
Replaces / Cross References
- Pleatco: PTL55XW-F2M
- Filbur: FC-0465 (some catalogs also list FC-0477)
- Dimension One (OEM reference): 1561-10
Compatibility Notes
- This cartridge uses a 2″ threaded bottom. If your current filter has a slip fitting, different thread size, or a different bottom style, you may need a different model.
- Always confirm fit by matching the 7″ diameter, 10-1/2″ length, and 2″ MPT bottom before ordering.
When to Replace
- Pleats are torn, frayed, flattened, or separating from the end caps
- Water stays cloudy or circulation feels weak even after cleaning
- Filter quickly plugs up again after rinsing
- End caps or threaded connection are cracked/warped and won’t seal properly
Related Products
- Unicel 7CH-552 (Shop / Options)
- Spa Cartridge Filter Cleaner
- Cartridge Cleaning Wand
- Spa Pre-Filters (Fill / Hose Filters)
- Spa Water Test Strips
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.
- Rotate between two cartridges when possible—one in use, one drying after cleaning—to extend overall filter life.
