Featuring one of the most advanced electronic control systems in the industry, Harmonic Hot Tubs automatically activates twice a day for a filtration cycle that you can easily customize. During this cycle, the pump runs at a low-flow, energy-efficient setting, drawing water from both the lower depths of the tub and the surface, where it skims away any floating debris that could form a water line. The water is then passed through our exclusive Silver Shield Micro Screen Cartridge and can be treated with the optional Harmonic Pure Mineral Cartridge. For centuries, natural minerals like silver and zinc have been renowned for their ability to kill bacteria and enhance water purity. Additionally, every Harmonic Pure system comes equipped with a built-in Ozone Generator and a specially designed reaction chamber that safely breaks ozone down into pure oxygen. As the hot tub operates, Harmonic Pure continuously oxidizes fine particles, eliminates bacteria, and greatly reduces the need for chlorine or bromine.