Usage Tips: POWERFUL AND EFFECTIVE: 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. ENVIRONMENTALLY SAFE: Free from harmful substances, this UV bulb is perfect for maintaining pristine water quality in ponds and filtration systems. Please follow proper disposal procedures at the end of its lifespan to minimize environmental impact and help preserve a healthier planet. Avoid direct exposure to UV radiation. EASY TO USE: Always power off the device before installing or replacing the UV bulb to prevent electrical hazards. Insert the bulb into the designated socket using the proper installation procedure, ensuring the UV tube remains intact. This bulb is compatible with inductive ballasts only and is not suitable for devices with electronic ballasts. VERSATILE APPLICATION: Designed for adaptability and practicality, this UV lamp is easy to carry and install wherever needed. 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 x 13W UV-C Replacement Bulb Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to vary slightly from the real thing. The measurement allowed error is +/- 1-3 cm.