Swell Round Airstones (Ball Airstones) can be used in either aquariums or ponds.
The air stone diffuses the air from the pump making lots of tiny bubbles (rather than large ones) which creates better saturation and helps distribute oxygen around the tank.
Swell airstones are great value compared to bigger brands and are solid reliable airstones which are very weighty and sturdy.
An air pump is needed to create the stream of bubbles. We have a wide range of energy efficient, compact air pumps, all at great prices.
Inlet size: 4mm, for use with 4mm hose.