The biOrb air stone adds an attractive flow of bubbles to the aquarium which not only looks good, it disseminates the oxygen in the water. It doesn't add oxygen, but it moves bubbles of it around the tank. It can also cover any noise from the aquarium.
The air stone can last up to three years depending on the local water supply. Hard water areas can lead to quicker calcification of the stone, so it will need changing more often.
Remove filter cartridge. Locate the air stone and pull upwards to remove. Gently push the new stone onto the one way valve stem - do not force down too far.
Contains 1 x Airstone