3Pcs Stone Bubble Oxygen Pump for Aquarium Fish Green

Made of quality material, can make your aquarium more effective pump oxygen. Can clean to repeated use, work time. Rising bubbles enhance aquarium aeration & water movement. Item type:  Stone Bar Condition: 100% brand new Material: sand stone + plastic  Weight: Approx. 242g Color: green Length: Approx. 31.5cmCelsius12.4in Instructions for use: 1. Please soak in water 15 minutes before using this product; 2. When -term using, if dirt blockage, you can clean to repeated use when the bubble is reducing; 3. Can be used with pumps of 2W and . (The larger of pump , the better the gas output effect).