【Replacement for 5W UV Aquarium lights】This 5W UV bulb replacement is specifically designed for use in fish tank, ensuring your water remains crystal clear. It turns green, cloudy water into a clear, healthy environment for your fish in a matter of days 【Wide Compatibility】This UV replacement bulb is compatible with the COODIA 5W UV filter pump and sunsun models including CUV-305, CUV-505, JUP-02 and CUP-805. It is ideal for maintaining clear water in both freshwater and saltwater aquariums 【Long-Lasting & Cost-Effective UV Bulb Replacement】Featuring a premium high-transmission quartz tube, this uv lamp delivers stable performance, durable construction, and a long service life of 8,000 hours, making it a highly cost-effective choice for sustained use 【Maintenance Guide for Peak Efficiency】Like all UV bulbs, the intensity of its light will gradually diminish with use. This decrease in power is a normal part of the product's lifecycle. We recommend replacing the bulb every 6 to 12 months depending on usage 【Important Safety Notice】This UV filter bulb emits short-wave UV radiation with a peak at 253.7 nm. To prevent eye and skin damage, never look at an energized UV bulb and avoid direct skin exposure to UV rays