Round Donut / Polo Style Air Stones – Hydroponic or Fish Tank/Aquarium
These air stones are lightweight plastic rings filled with little holes, once the air stone is connected to an air pump, air is pumped through the stone and released into the tank or reservoir, oxygenating the liquid and keeping it fresh.
Air stones can be placed anywhere in a tank or reservoir. Simply connect to 4mm Air Line and that, in turn, to an Air Pump and you’re ready to go.
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