http://forum.aqua-fish.net/ A forum devoted to aquarium fish, plants, techniques and fish keeping as a whole. en http://forum.aqua-fish.net/?topic=airstone#1 I’m new to aquariums... What is an airstone and what is its function??? Jane original post: February 20, 2007, 3:26 pm anonymous 2008-05-01 http://forum.aqua-fish.net/?topic=airstone#2 Airstone is basically an aquarium equipment that diffuses air from the air pump and that is how air bubbles are formed in your aquarium. Steve anonymous 2008-05-01 http://forum.aqua-fish.net/?topic=airstone#3 Airstones are basically made up of compressed ceramic or glass beads and they are available is various shapes and sizes. An airstone has to be connected to an air pump to perform its function. Laryn anonymous 2008-05-01 http://forum.aqua-fish.net/?topic=airstone#4 Small airstones are used to power undergravel filters and the large airstones are for decoration only. Ralf anonymous 2008-05-01