5 Inch Round Air Stone Disc Bubble Diffuser For Aquarium Fish Tank Hydroponics Pump Ceramic Air stones Air Pump This is a great air stone- it makes a super-fine bubble stream. The air stone release air bubbles smaller, denser, more uniform, help fish swim happily in aquarium, fish tank, koi pond. Ideal for your fish tank or aquarium, it is the best partner for air pumps. Size: 5-Inch /3-inch Shape: Round Features: Ozone aerated stone, bubble stone, using super hard gold steel sand, after high temperature sintering, good gas diffusion, good filterability, ozone resistance, corrosion. Increase oxygen levels, lower CO2 and raise PH, creates water currents It is an important instrument to successfully keep aquatic fish for respiration process. Durable, can be reused and washed repeatedly. Creates bubbles in fish tank while attached to an air pump(air pump and air tube is not included). Note: -Soak in water for 2 hours before use. -For long-term use, if there is dirt blockage, and the bubbles is reduced, please take it out of the fish tank and wash it.