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Premium Grade Large Cylinder Air Stone by Pawfly Premium quality ceramic Cylinder Air Stone provides exceptional results for Hydroponic growth. This LARGE one is 4" long by 2" in diameter and weighs 0.8lb. Comes with a 3-month fully Warranty. Simply Contact us for a Full Refund If You are Not Fully Satisfied - No Questions Asked! Usage: Please soak the air stones in water for about 30 minutes before usage. After a long-term use, clean your stone regularly so that it will be most effective. Replacing the air stone every six months.