Raomdityat Aquarium Fish Tank Pond Air Stone Disk Diffuser Bubble Plate Black Trim Black The ceramic airstone suitable for all aquarium or pond aeration. The disc air stone can be used for a long time and be easily washed for re-use. The disc air stone is suitable for freshwater, saltwater aquariums and hydroponic use. It also can be applied in aqua farms, aqua cultures, and other industrial aeration. The disc air stone increases the level of dissolved oxygen in the water.