Unicel 4CH-23 Replacement Spa Filter Cartridge (Top-Load Style)
The Unicel 4CH-23 is a replacement pleated spa filter cartridge designed for select hot tub and spa filtration systems that use this specific cartridge style and fitment. Replacing a worn or damaged cartridge helps restore circulation, improves water clarity, and reduces strain on spa pumps and heaters.
Key Features
- Replacement spa cartridge filter for compatible filter canisters
- Pleated media captures fine debris for clearer water
- Durable end caps and rigid core built for repeated cleaning cycles
- Helps maintain steady flow when rinsed and cleaned on a routine schedule
Compatibility Notes (Important)
- Many spa cartridges look similar—match by part number (4CH-23) whenever possible.
- Before ordering, compare your existing filter’s:
- Outside diameter and overall length
- Top end style (open, closed, handle, or cone/knob)
- Bottom end style (open, slip, or threaded—if threaded, confirm thread size/type)
- If your current cartridge uses a threaded screw-in base, confirm the thread type matches exactly.
When to Replace
- Pleats are torn, frayed, flattened, or separating from the end caps
- Flow is weak or the spa struggles to circulate even after cleaning
- Water stays cloudy despite balanced chemistry and normal sanitizer levels
- End caps are cracked/warped or the inner core is weakening
What’s Included
- (1) Unicel replacement spa filter cartridge
Related Products
- Spa Cartridge Filter Cleaner
- Cartridge Cleaning Wand
- Spa Water Test Strips
- Spa Fill / Hose Pre-Filters
- Spa Scale Remover
Maintenance Tips
- Rinse the cartridge regularly (often weekly with heavy 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 consistency.
