AQUANEAT Air Stones for Ponds 2 Inch Long Lasting Aerator Oxygen Diffuser Air Pump Accessories for Aquariums Fish Tanks Hydroponics and DWC Reservoirs 4 Pack

Fine bubble Compared with ordinary bubble stone creating more fine bubbles makes the dissolved oxygen amount larger Widely applicable Suitable for hydroponic systems aquarium fish tanks preventing ponds freezing in winter helping extend the life of your nutrient solution keep fish roots healthy and promote plant growth Air Stone Dimension 2 D Connector Diameter 316 or 38 Recommended air pump power 4 W Quality material Made of mineral material and sintered at a high temperature Stable and durable long lasting use Safe to your fish Note You have to soak it in water for about 30 minutes before connecting to an air pump to run it Clean it after a period time of use.