Simple Deluxe 4 X 2 Inch Large Air Stone Cylinder for Fish & Plant in Aquarium and Hydroponics Air Pump

Size: 4" X 2" X 2". Fits for 4mm inner diameter tube.
Quality and safe materials: Made of safe and washable material -Silicon carbide, non-toxic materials are safe for your fish. (Soak the stone completely in water about 1 hour before use)
Widely applicable: Suitable for hydroponic systems, ponds, aquarium fish tanks, helping extend the life of your nutrient solution, keep fish/ roots healthy and promote plant growth.
Features: High-temperature sintering, the air stones for aquariums are sturdy, durable and washable. The dissolved oxygen rate is high, producing uniform and tiny bubbles. Increase oxygen and reduce carbon dioxide levels.
Tip: Air stones need to be replaced every few months because they are blocked by dust, bacteria and algae. Clean regularly by a brush.

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