The air stone, located at the base of the aquarium, breaks up the flow of air into
the aquarium into a mass of bubbles. After a time the air stone can become blocked
by calcification, especially in hard water areas, reducing the flow of air into the
aquarium. Replacing the air stone every few months will keep your aquarium bubbling
away nicely. In some hard water areas it may be necessary to replace the airstone
more frequently, but once every 6 months should be sufficient for most owners.
Replacing the airstone is extremely easy. The airstone is located in the centre of
the aquarium under the filter cartridge, simply remove the filter cartridge and you
will be able to locate the airstone. A replacement airstone can simply be pushed
into place. Each BiOrb Air Stone accessory pack includes one relacement air stone.