Swim Spa Filter Set, confirm this fits your swimspa prior to ordering.

Cartridge filter for Master Spas H2X Swim Spa, Crosstrainer, and Crosstrainer 2. 

Master Spa Swim Spa Filter Set (2 Filters)

Microban Filter & Eco Pur Filter  This filter is obsolete. Replacement: PWW50P3+8550

https://dynastyspasparts.com/pww50p3

https://dynastyspasparts.com/great-barrier-8550-filter/

PWW50P3:
Diameter: 6"
Length: 7-5/8"
Bottom Hole: 1-1/2" SAE

8550:
Diameter: 6"
Length:8-1/4''Bottom Hole: 1-1/2" SAE