Sunsun UV Light is an aquarium UV sterilizer light submersible water clean lamp for pond fish tanks. Sunsun UV Light is an aquarium UV sterilizer light submersible water clean lamp for pond fish tanks. Inhibit the growth of dangerous microorganisms in the water Prevent the growth of germs and the reproduction of algae. Reduce the amount of fish in the environment. Ensures the water is clear. Made of high-quality materials for durability. For safer operation, a separate power switch is recommended.