POWERFUL AND DURABLE: This UVC light is designed to optimize water filtration systems in ponds, pools, and similar environments, improving water purification efficiency; Featuring a high-transmission quartz tube and G23 base, it provides a long lifespan of up to 8,000 hours, offering a reliable solution for continuous use SAFETY FIRST: Ozone-free design helps maintain clean water quality in ponds and filtration systems; Proper disposal at end of life is recommended to minimize environmental impact EASY TO USE: Always power off the device before installing or replacing the UV bulb to avoid electrical hazards; Insert the bulb into the designated socket using correct installation methods to ensure the UV tube remains intact; Compatible with inductive ballasts only and not suitable for electronic ballast devices VERSATILE APPLICATION: Designed for adaptability and practical use, this UV lamp is easy to install in various settings; Specifically made for lighting systems with G23 base, 13W lamps, and inductive ballasts to ensure proper functionality EXTENSIVE COMPATIBILITY: Works with a range of pond and fountain filters, including various GPH pond filters requiring a 13-watt UV light, providing consistent water purification performance Color: As Shown Material: Glass Package Contents: 2 x 13W UV-C Replacement Bulb