biorb Air Stone
The air stone fits in the base of the biOrb underneath the filter cartridge. It breaks up the flow of air into the aquarium, splitting it into a mass of fine bubble. It also reduces noise from the air pump.
Over time, the tiny pores in the air stone may become blocked by dirt or limescale preventing air from getting through properly. Depending on your local water supply and the conditions in your biOrb, an air stone can last anywhere from 3 months to 3 years.
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