The Amazon Riverjet swim spa model is designed for swimming enthusiasts. Choose our Amazon Riverjet swim spa for your home, a product that embodies in one the perfect tool for an afternoon workout and a place to relax with your children. . At 7.7 ft wide and 18 ft long, it has a prestigious look and an updated design. Thanks to its semi-cabinet design, you don’t have to bother with the very costly and time-consuming installation work; all you have to do is just simply use the swim spa.