Ario air pumps are submersible, venturi-style pumps that can be positioned beneath the gravel bed, making them virtually free of noise and vibration. Easy to disassemble, clean and reassemble, they are made from non-perishable components (no rubber membranes) and are safe for fresh or salt water. Adjustable airflow control is located outside the tank for easy adjustment. Ario 3 Turbo is rated for tanks up to 16" deep