The Biorb Airstone at the base of the aquarium breaks up the flow of air into the aquarium into a mass of bubbles. After a time the Biorb Airstone can become blocked by calcification, especially in hard water areas, reducing the flow of air into the aquarium. Replacing the Biorb Airstone every few months will keep your aquarium bubbling away nicely.
These are suitable for the Biorb and BiUbe aquariums.
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