The Tri - X Filter Cartridge fits the following Hot Spring Spas:
Aria
Envoy
Grandee
Jetsetter
Prodigy
Propel
Sovereign
Square
Stride
Triangle
Triumph
Vanguard
Built specifically for Hot Spring® Spas fitted with the Freshwater III CD Ozone system or ACE® Salt Water System.
These filters made from high performance silicone with central contortion band.
These filters out perform the alternative filters in durability and effectiveness.
Dishwasher safe
Larger Filtering capacity than the standard paper filters
Extremely Durable