The Unicel 4CH-35 Cartridge Filter is a high-capacity replacement filter designed for superior water clarity in spas and hot tubs. With 35 square feet of pleated polyester filtration media, it provides excellent dirt-holding capacity, consistent flow, and long-lasting performance for Waterway and compatible spa filter systems.

Key Features

Genuine Unicel replacement cartridge filter (Model 4CH-35)
35 sq. ft. of pleated polyester media for maximum filtration efficiency
Measures 4-5/8" diameter x 16" length
1-1/2" MPT (male threaded) bottom fitting for secure installation
Premium polyester media resists chemicals, oils, and debris buildup
Reinforced center core for superior strength and structural stability
Compatible with Waterway and other spa filter housings of matching dimensions
Easy to install, remove, and clean for extended service life
Designed for optimal water flow and minimal pressure drop
Ideal for spas, hot tubs, and small pool systems requiring high-efficiency filtration

Product Overview
The Unicel 4CH-35 Cartridge Filter provides professional-grade filtration performance in a compact, durable design. Engineered for Waterway and similar spa systems, it captures fine debris, oils, and contaminants, ensuring crystal-clear water and balanced filtration flow.

Constructed from durable, chemical-resistant materials with a rigid internal core, the 4CH-35 withstands demanding spa environments and frequent cleanings. Its threaded 1-1/2" MPT connection ensures a secure, leak-free fit, making it a dependable, easy-to-maintain replacement choice for consistent spa and hot tub filtration performance.

Unicel | 4CH-35 | Cartridge Filter – 35 Sq. Ft., 16" Length, 1-1/2" MPT Threaded Fitting