The SOBO AQ-18H Multifunctional External Waterfall Filter is a premium wall-mounted Hang-On-Back (HOB) aquarium filter designed to provide efficient filtration for aquariums up to 4 feet. Powered by an energy-efficient 6W motor, it delivers a 500L/H flow rate while combining mechanical filtration, biological filtration, water circulation, and oxygenation in one compact unit. The integrated Bio Wheel helps provide additional surface area for beneficial bacteria, supporting a healthier aquarium ecosystem. Designed with multiple filtration chambers, the AQ-18H comes complete with filter materials and a built-in water pump, allowing immediate installation and effective filtration. The waterfall return improves water circulation while enhancing oxygen exchange, helping maintain crystal-clear water and a healthier environment for fish and aquatic plants. Its external wall-mounted design saves valuable space inside the aquarium while making maintenance quick and convenient. Suitable for freshwater aquariums, planted tanks, tropical fish, shrimp tanks, and community aquariums, the SOBO AQ-18H Waterfall Filter is an excellent filtration solution for everyday aquarium care.