Unicel C-5345 Replacement Spa Filter Cartridge50 Sq Ft (Marquis / String Handle Style)
The Unicel C-5345 is a high-quality 50 sq ft pleated spa filter cartridge commonly used in select
Marquis Spas and other hot tub filtration systems that use a closed top with a string handle.
Replacing a worn cartridge helps restore circulation, improves water clarity, and reduces strain on the spa pump and heater.
Key Features
- 50 sq ft filtration area for strong debris capture and steady spa flow
- Closed top with string handle for easy removal during cleaning
- Open bottom design for compatible standpipe/canister connections
- Durable pleated media and rigid inner core built for repeated cleanings
Specifications
- Part Number: C-5345
- Filter Type: Pleated spa cartridge
- Filtration Area: 50 sq ft
- Top End Cap: Closed (string handle)
- Bottom End Cap: Open
- Common Size Class: 50 sq ft string-handle style cartridge (confirm measurements before ordering)
Compatibility Notes
- Used in select Marquis and similar spa filter canisters that take a 50 sq ft cartridge with a string handle top.
- Best practice: match by part number and verify your existing cartridges outside diameter, length, and bottom opening (ID).
- If your current filter is close in appearance but a different height or bottom opening, choose the cartridge that matches your exact measurements.
When to Replace
- Pleats are torn, frayed, or separating from the end caps
- Cartridge remains restrictive even after a thorough rinse and deep clean
- Water stays cloudy despite balanced chemistry and proper sanitizer levels
- End caps are cracked/warped or the inner core is collapsing
Related Products
- Unicel C-5345 (Shop / Options)
- Spa Cartridge Filter Cleaner
- Cartridge Cleaning Wands
- Spa Water Test Strips
- 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 cloudy water.
- Deep clean every 36 weeks using 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 performance.
