Unicel® C-4326 – 25 Sq Ft Rainbow/Waterway Spa Filter Cartridge – part #C-4326

Power off the spa and remove the existing filter from the housing.

Rinse the new C-4326 filter thoroughly to remove any loose fibers.

Insert the new filter with both ends fully seated in the housing.

Restore power and ensure proper water flow through the filtration system.

Clean regularly and replace every 12 months for optimal performance.

Q: What spas does the C-4326 fit?

A: It fits many Rainbow and Waterway models—check measurements and open-end design for compatibility.

Q: How does this differ from the C-2302?

A: The C-4326 has open ends with a 2-1/8" inner diameter; the C-2302 has a closed top and threaded bottom.

Q: Can I clean and reuse this filter?

A: Yes, rinse weekly and deep clean monthly to maintain flow and water quality.

Q: What’s the recommended replacement cycle?

A: Every 12 months or sooner with heavy use.

Q: Is this genuine Reemay® material?

A: Yes, it’s made with 100% Reemay® for durability and superior filtration.