Every VULCANO airstone is a unique, selected piece of genuine volcanic rock.
By means of the internal hollowing-out of the stone, the air seeks the path of
least resistance, giving a different air output at different points.
Large air bubbles can thus be expelled even without the use of a powerful
airpump.
The underside is flat for easier installation in the tank.
Attention:
Every stone is individually finished and tested.
Evey stone has different sizes and lookings
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