Medium Bubble: Airstone balls produce dense and rich air bubbles. A great way to increase oxygen solubility and active aquatic life in your aquarium. Reliable material: Made of mineral material and sintered at high temperature. Ideal for aeration in aquariums, DWC systems or ponds. keep fish or roots healthy Stable in water: Each ball is 5 cm in diameter and weighs about 106 grams. Moderate weight, sinks to the bottom and sits securely in your tank for stable air bubbles. EASY TO USE: Thoroughly soak the stone in water for 1 hour before use. Use a brush to clean it regularly as it can clog after weeks or months of use. Diameter 5cm: total height 76mm, diameter about 50mm (excluding air nozzle size); air nozzle diameter: 4-6mm.
