Medium bubbles: The air stone disc produces dense and abundant bubbles. A great way to increase oxygen solubility in your aquarium and enliven aquatic life. Jet volume: 2 L/min; Recommended air pump power: 2W - 4W; Inner diameter of standard air tube: 0.5 cm. Suitable for use in aquariums, fish tanks and small ponds. Reliable Material: Made of mineral material and sintered at high temperature. Ideal for aeration in a DWC tank. Helps maintain healthy fish or root growth. Stable in Water: Each disc measures 4D x 1.8H (cm) and weighs 28.3g. Its round and flat shape allows it to always sink to the bottom and stay firmly in place in the tank. Easy to use: soak the stone completely in water for 1 hour before use. Clean it regularly with a brush because it clogs after weeks or months of use. Air Stone discs 4 CM Air Stone discs 4 CM offer durability, bubble stability and high dissolved oxygen. Optimal for aerating your water tanks and brightening up your aquatics. A must-have in the water
