The SunSun Aquarium Internal Aquarium Pump HJ-311B is a compact submersible internal filter and pump for aquariums. It provides up to ~300 L/h flow with low 2 W power, combining filtration and water circulation while helping oxygenate the tank. Ideal for small freshwater or saltwater aquariums (up to ~40–50 L), it’s easy to install, quiet, and helps keep water clean and healthy for fish and plants
