The Del Ozone ECS-1RPOZM-U Spa Eclipse Ozone Generator is ideal for almost any spa. Using DEL's patented CD Chip technology makes this unit energy efficient which reduces operating costs. There is no starter or ballast and the isolated circuitry eliminates voltage spikes. The Spa Eclipse chip is water resistant and generates much less heat than UV systems. The Spa Eclipse has a viewing window which allows you to see the CD energy field.