6-Pack Large Air Stones, Humongous 4 x 2 Inch Round Air for Aquarium, Hydroponics, Fish Tank, Koi Pond, Cylinder Bubble Diffuser for Pump, Growing System

-Stable in Water: Each cylinder measures 2" D x 4" H and weighs 0.66 lbs. It can easily sink to the bottom and stand stably in your tank for steady bubbles.
-Fits for 3 16 inch standard airline tubing.
-Recommended a high-output air pump at least 10W or a commercial air pump.If you feel that there are fewer bubbles, you can try using a high-power air pump, which will have a good effect
-Reliable Material: Made from washable silicon carbide. The material is sturdy , it causes no effect on the health of your aquatics. Help keep fish or roots growing healthily.( Soak the stone completely in water for 2 hours before use; Clean it regularly with a brush as they get clogged after weeks or months of usage).
-Widely Applicable: Fit for hydroponic systems, koi ponds, aquariums or fish tanks, and other systems, helping extend the life of your nutrient solution, keep fish roots healthy and promote plant growth.