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Jainsons Pet Products 3 Inch Large Air Stone for Aquarium and Fish Tank Healthy Environment Increase Oxygen with Brass Nozzle for Biofloc and Fish Farming. Abundant Tiny Bubble: This 3" crazy air stone will create much more abundant cascade of tiny bubbles than you can ever imagine! Each air stone has 180 ultra-tiny 100 ?m air holes which can create 500,000 bubbles in every minute. Connector helps it live a long life. BEFORE USE: You have to soak it in water for about 6 hours before connecting to an Air pump more than 4 W to run it. Please soak the stone completely in water about 6 hours before use. Package Content: Brass Air Stone 6pcs