The NUVO Sterilizer is used in addition to chlorine and will instantly eliminate bacteria. When water passes through the NUVO chamber, the result is the safest, cleanest water on earth and all this is done in perfect safety for only pennies a month. NUVO Ultraviolet Sterilizers are specifically designed for pool and SPA environments and will provide many years of trouble free, uninterrupted service. Each Sterilizer is packed with necessary plumbing connectors inside the box.