Rena Air Pump can provide additional aeration and filtration which will reduce your aquarium maintenance. The innovative use of the expansion chambers, curved casing and tight fitting base makes the Rena Air the quietest air pump yet. All Rena Air range products have noise suppression chambers, long-lasting diaphragm and unique precision locking base. Air pumps can be used with an under-gravel filter system for increased biological filtration, general aeration and gas exchange and to power underwater ornaments or bubble displays for added enjoyment of your home aquarium.