Non-toxic mineral material: The air stones are made of high-quality non-toxic mineral material and sintered at high temperature, and the stones are strong and durable. Ideal for aeration in a DWC tank. Helps maintain healthy fish or root growth. Airstone size: each disc measures 4cm deep x 1.5cm high.Suitable for use in aquariums, fish tanks and small ponds. Its round and flat shape allows it to always sink to the bottom and lie down evenly in the tank. Recommended air pump power: 2 W - 4 W; Standard ID air tube: 0.5 cm. Provide oxygen: connect it to the air pump and place it in the water so that the air pump can pump oxygen into the water. Ideal for adding oxygen to ponds, hydroponics and circulation systems and reducing CO2 content. Wide Application: These air stones can be used in aquariums, ponds, aquariums, freshwater, saltwater, hydroponic or in water farms. The small and dense bubbles produced by Air Stones can not only provide fish with oxygen, but also create beautiful
