The BiOrb Air Stone replacement fits in the base of the tank underneath the filter cartridge. It breaks up the flow of air into the aquarium, creating a mass of fine bubbles. It also reduces noise from the air pump.

Over time the tiny pores can become blocked by dirt and lime scale preventing air from getting through properly. Depending on your local water supply and the conditions in your tank, the air stone can last anywhere from 3 months to 3 years.

Replacement from time to time is advisable.

Pack of 2

Suitable for use with the BiOrb Life 15L