Bubble stone Commonly known as diffuses stone (Sha Tau), a durable, good aeration, filtration, and widely used:A sewage plant for aeration and Stirring to prevent large particles of sediment deposition, and removal of some organic matter. Aquarium (fish farms) strophic water body increase into the environment, bio-farming increase Live fish and seafood transport increase . Aquarium (purifiers) purification, filtration and water quality and aeration. Other required air diffusion process uses. Artificial Plant only,other accessories in the picture is not included!