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Bubble stone Commonly known as diffuser stone (Sha Tau), a durable, good aeration, filtration, and widely used:A sewage treatment plant for aeration andStirring to prevent large particles of sediment deposition, and removal of some organic matter.Aquarium (fish farms) eutrophic water body increase oxygen into the environment, bio-farming increase oxygenLive fish and seafood transport increase oxygen.Aquarium (purifiers) purification, filtration and water quality ozone sterilization and aeration.Other required air diffusion process uses.Note:-Soak in water for 15 minutes 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 again and again.-The air stone can be used repeatedly.