This low voltage, safe air pump provides the bubble supply that powers the filter system and assists with oxygen diffusion in the aquarium. It is essential the air pump is left running permanently. This air pump is suitable for all biOrb aquariums excluding the baby biOrb. The air pump is designed to run as silently as possible but due to its pumping action internal vibration will be transmitted as noise if the air pump body touches surrounding objects. As the air pump is essential to maintain water quality and runs continuously 24 hours a day, it is advisable to keep a spare in the event of failure.