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. Spray Volume: 2 L\/min; Recommended air pump power: 2W - 4W; Standard air tube ID: 0.5cm. 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. Water Stable: Each disc measures 4D x 1.5H (cm). Its round, flat shape allows it to alwPXCL sink to the bottom and sit securely in the reservoir. 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. Scope of application: short column gas stone with a general pipe inner diameter of 4 mm; Description Function: Connect to the air pump and put it into the water to help the air pump pump oxygen into the water. Matters needing attention: You need to connect the air pump to get air Product Features: The high-temperature sintered air stone is made of high-temperature sintering, which is different from ordinary commercially available air stones. The material is firm and durable, and can be cleaned repeatedly and used for a long time. . Delivery quantity: One piece