Ensure that your Excalibur Disinfection System is operating effectively by replacing the Ultra Violet Lamp after every year of running time. After twelve months, the ultraviolet (UV) light from this lamp will no longer provide the necessary output to ensure proper bacterial disinfection. This replacement UV Lamp / Bulb can be installed without the use of any tools. Step by step details on how to reset the UV Lamp Counter are included on the lamp packaging.