Powerheads are available in a range of sizes to suit different size aquariums and accessories. Some are equipped with a venturi device, which adds a stream of air bubbles to the outgoing flow (but reduces the overall turnover rate). Most have an adjustable output direction, and some have a flow speed control.
Powerheads can be used to create additional circulation, provide additional mechanical filtration with the aid of add-on cartridges, or power additional devices such as fluidised bed filters. In marine aquaria, several powerheads are often used to create the turbulent circulation necessary for many reef tanks, and can be controlled electronically to create different 'wave' patterns.
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