Unicel 5CH-37 Hot Tub Filter for Aquaterra SpasThe 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

It helps create a more comfortable spa experience by minimizing common issues like skin or eye irritation

chemical-safe outer shell withstands year-round outdoor and water exposure

Works with all spa flow rates

Designed to weight and secure inground pool covers

1300 Wellness - Swimspa

1-year warranty

Its adjustable and versatile design enables it to fit snuggly over a range of different drain sizes

1700 + 1701 Cascade Wellness Ultra - Swimspa

so you can enjoy a refreshing escape right at home

Pleatco PWW35L

cleaning every corner of your spa

and clean instantly