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A body corundum aerator design and manufacture by trial and error, novel and unique, has the following advantages: 1. Simple structure, a figure only three parts, assembly speed, bottom installed debugging easy 2. Good sealing, prevent different material contact closely, not 3. Leakage phenomenon surface area is large, by measuring the surface area increased by nearly 75%, also increases the oxygen increase oxygen transfer efficiency, or expand the service area, a shape aerator service area of 0.5 to 0.5 m2 / a (H2O) 4. Good aeration agitation, the original only positive aeration aerator, a body aerator is at the same time on both sides of aeration, can make it easier for bottom water stirring push up stream.