Bubble Stone Blue air stone, known as diffuse stone, durable, good gas permeability, good filtration ability. Immerse the air bubble stone in water for approximately 30 minutes before use. Dissolving in Oxygen The air bubble stone increases oxygen levels, reduces CO2 and increases PH . Filtration and improvement of water quality ozone, sterilization and aeration. If dirt blocks it and air bubbles are reduced, you can take it out to clean and use it repeatedly. Unique Design Blue cylindrical design, retro tones. Connect the air stone to the bubble pump and place it in the aquarium so that the air stone can pump oxygen into the water, and the beautiful bubbles add a beautiful landscape to the aquarium . Superior Materials The air bubble stone is made of high quality sand and plastic. Strong, durable, non-toxic and safe. It has a long lifespan. The blue air stone is very easy to clean, just brush the surface, it can be reused for a long time. Wide Uses The plastic air blue stone can be used in the pond to fish (aquaculture farm), aquarium purification (purifier), other uses of processes needing to diffuse air. It is an important tool to successfully keep aquatic fish for respiration process. Length 2.5*1.5mm Delivery quantity: 24pcs luckymeet