An airstone, also called an aquarium bubbler, is a piece of aquarium furniture, traditionally a piece of limewood or porous stone, whose purpose is to gradually diffuse air into the tank, eliminating the noise and large bubbles of conventional air filtration systems, and providing other benefits to the health of the fish. Airstones are sold in a v...
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http://en.wikipedia.org/wiki/Airstone
A device that attaches to the air pump to create various bubble effects.
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https://www.encyclo.co.uk/local/23227
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