POWERFUL AND : This UVC light is specifically designed to optimize water filtration systems in ponds, pools, and similar environments, significantly improving water purification efficiency with a rate of 99.9%; Crafted with high-transmission quartz tube and a G23 base, it ensures a long lifespan of up to 8,000 hours, offering a cost-effective solution for continuous use : Free from , this UV bulb is perfect for maintaining pristine water quality in ponds and filtration systems; Please proper disposal at end of its lifespan, minimizing environmental impact and helping to preserve a healthier planet UV radiation hazard. EASY TO USE: Always power off device before installing or replacing UV bulb to prevent electrical hazards; Insert bulb into designated socket using proper installation procedure, ensuring UV tube remains intact; This bulb is compatible with inductive ballasts only and is not suitable for devices with electronic ballasts VERSATILE APPLICATION: Crafted with adaptability and practicality in mind, this UV lamp is easy to carry and install wherever needed; Additionally, it is specifically designed for products with G23 base, 13W lamps, and inductive ballasts, ensuring optimal performance in compatible lighting systems; EXTENSIVE COMPATIBILITY: This bulb is designed to work with a variety of pond and fountain filters, including various GPH pond filters with 13-watt light, delivering effective water purification Color:As Shown Material:Glass Package Contents: 2 * 13W UV-C Replacement Bulb Only above package content, other products are not included. Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.