airstone
Noun
Meaning
airstone (plural airstones)
English Wikipedia has an article on:airstoneWikipedia
A piece of aquarium furniture, traditionally limewood or porous stone, whose purpose is to diffuse oxygen gradually into the tank, eliminating the noise and large bubbles of conventional air filtration systems.
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Examples
As with deep water culture, there is an airstone in the reservoir that pumps air into the water via a hose from outside the reservoir.
Both the airstone and the water pump run 24 hours a day.