Air Stone, 4 X 2 Inch Large Air Stone Cylinder, Aerator Bubble Diffuser, Air Pump Accessories For Hydroponic Growing System, Pond Circulation, Aquarium Fish Tank (4 Pack)

Features: 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 Fits for 3/ 16 inch standard airline tubing Quality and safe materials: Made of safe washable and non-toxic material. (Soak them for at least 2 hours before use) Recommended a high-output air pump or a commercial air pump Dimension: 2 D x 4 H Note: Soak them for at least 2 hours before use and clean regularly by a brush as they get clogged after weeks or months of usage