Caldera 74148 | 35 sq ft Aventine Spa Filter Brand_Leisure Time Spa and they are not interchangeable:

and they are not interchangeable: the 5CH-352

1 x Hot Spring 77180 Rotary Hydromassage Jet

6″ (15mm) cordierite stone baking board

The Tri-X 73178 replacement filter is a factory-original ceramic cartridge filter for Hot Spring Spas

1 x FreshWater III 72606 HO Ozone System

Caldera 74148 | 35 sq ft Aventine Spa Filter Brand_Leisure Time Spa and they are not interchangeable:The Caldera 74148 filter cartridge is a factory original replacement for select Caldera Aventine spas. With 35 square feet of filtration across 185 pleats of heavy duty polyester, it delivers more efficient filtration and better water clarity so you spend less time cleaning and more time enjoying your hot tub. Filtration is what keeps spa water clear and comfortable. Every soak leaves behind body oils, lotions, hair, and fine debris, and the cartridge