The Maxi-Jet delivers optimal water circulation, adjustable aeration and reliable and silent performance at all times. The powerhead is ideal for powering undergravel filters or generating internal water movement. The compact, efficient Maxi-Jet design makes it suitable for freshwater or marine aquariums or terrariums and versatile enough for a multitude of internal and external applications from creating gentle waterfall effects to powering undergravel filters. Its powerful flow maximizes oxygenation throughout the gravel bed of undergravel filters to provide a viable biological filtration site for the growth and proliferation of BIO-Spira bacteria. The Maxi-Jet features a silent, adjustable venturi-action air filter, a screened intake tube adapter and an intake foam cartridge grid support, a fully rotational outflow, a sealed impeller output, and a triple-suction mounting bracket with an adjustable hook and cable guide.