The Wave Propulsion™ Technology features a unique propeller design that provides a wider, deeper, and smoother current — giving you a swimming experience that is far superior to any other swim spa. The resistance is fully adjustable with the Swim Number System™ that allows swimmers of varying skills to customize the flow. And convenient digital controls allow you to set the water temperature where it's most comfortable for you. That's why consumers in an independent third party blind comparison with the leading competitors chose the Master Spas Swim Spa System as the top swim spa by a wide margin.