The Unicel 5CH-203 Cartridge Filter is a 20-square-foot premium replacement cartridge designed to replace traditional sock filters used in LA Spas and compatible hot tub systems. It offers superior filtration efficiency, easy maintenance, and longer service life compared to standard fabric filters, providing consistently clean, clear spa water.

Key Features

Genuine Unicel replacement cartridge filter (Model 5CH-203)
20 sq. ft. of pleated polyester media for high-efficiency filtration
Direct replacement for LA Spas sock-style filters
Measures 5-3/16" diameter x 8" length
Features open top and molded bottom fitting for secure installation
Premium polyester filter media resists chemicals, oils, and debris buildup
Reinforced center core for stability under high water flow
Provides longer service intervals and easier cleaning than sock filters
Maintains optimal water clarity and circulation efficiency
Ideal for residential spas, hot tubs, and LA Spas systems

Product Overview
The Unicel 5CH-203 Cartridge Filter offers a modern, high-performance upgrade for LA Spas using traditional sock-style filters. Its pleated polyester media provides superior dirt-holding capacity and filtration precision, ensuring clearer, healthier spa water with reduced maintenance effort.

Engineered for strength and durability, the 5CH-203 features a reinforced core that withstands pressure and frequent cleanings, while its design allows for quick, easy installation. By replacing outdated fabric socks with Unicel’s rigid cartridge technology, spa owners benefit from improved filtration efficiency, faster cleaning, and longer filter life—making the 5CH-203 a cost-effective and reliable replacement solution.

Unicel | 5CH-203 | Cartridge Filter – 20 Sq. Ft. Replacement for LA Spas Sock Filter