Unicel 5CH-37 Hot Tub Filter for Aquaterra Spas 5t Replace when the Zorbie starts

Replace when the Zorbie starts to sink

Screw-cap valve helps prevent leaks

tackling dirt

With recommended application every six months or as needed

The Unicel C-4305 has been used in a variety of hot tub models and brands over the years

Unicel 5CH-37 Hot Tub Filter for Aquaterra Spas 5t Replace when the Zorbie startsThe Unicel 5CH 37 is a premium replacement filter used in select Aquaterra Spas and Watkins Hot Springs Spas models that require the OEM 303279 filter. Because both Watkins and Aquaterra have used different sized filters across their spa models over time, its important to confirm this cartridges dimensions match your existing filter before ordering to ensure the correct fit. Specifications: Part Number: 5CH 37 Diameter: 5 5 16" Length: 9" Top: Handle