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“Cow dung buoyant device” is organic and a product that can be recycled. After being heat pressed, with the characteristics of cow dungs, this product can be placed in the sea, it will be biodegraded into fiber for fishes to eat or decompose naturally after a year. It is suitable for coastal industries, such as oyster sheds. Its head and end are streamlined to reduce resistance, the upper groove is added to standardize the placing of the sheds, and the handles on both sides make it easier to grab. Its alkalescent can neutralize the acidic water caused by air pollution.