The Unicel 4CH-920 Cartridge Filter is a high-quality 20-square-foot replacement cartridge designed for spas and hot tubs. Engineered with precision pleated polyester media and a 1-1/4" SAE threaded fitting, it provides excellent filtration efficiency, easy installation, and long-lasting performance for clear, clean water in compact spa systems.

Key Features

Genuine Unicel replacement cartridge filter (Model 4CH-920)
20 sq. ft. of pleated polyester filtration media for effective debris capture
Measures 4-5/8" diameter x 6-3/4" length
1-1/4" SAE (coarse threaded) bottom fitting for secure installation
Premium polyester media resists chemicals, oils, and degradation
Reinforced core design maintains structural integrity under high flow rates
Compatible with select Waterway, Vita Spa, and other spa filtration systems
Easy to clean and reinstall for extended service life
Ensures consistent flow and optimal water clarity
Ideal for small to medium-sized spas and hot tubs

Product Overview
The Unicel 4CH-920 Cartridge Filter offers reliable, long-term filtration performance in compact spa and hot tub systems. Its precision-engineered pleated polyester media efficiently traps fine debris and contaminants, ensuring crystal-clear water and balanced filtration.

Featuring a durable 1-1/4" SAE threaded connection, the 4CH-920 installs easily and provides a secure, leak-free fit in compatible filter housings. Built to withstand chemical exposure and repeated cleanings, this Unicel cartridge maintains high flow performance and extended lifespan—making it a trusted choice for spa owners seeking dependable, low-maintenance water filtration.

Unicel | 4CH-920 | Cartridge Filter – 20 Sq. Ft., 6-3/4" Length, 1-1/4" SAE Threaded Fitting