Function of an Air stone in an Aquarium

An air stone is a special piece of porous stone through which air from an air pump is passed. The many holes on the porous surface of the air stone serve to release air as many small bubbles which is pleasing to look at.

The bubbles agitate the water in the surface and help in oxygenation.

There are wooden air stones as well which are made from special types of wood such as tila. Today, there are synthetic airstones as well which are made from fiberglass.

Air stones may need to be cleaned periodically for better flow.