| 摘要 |
Apparatus for use in aeration of a fluid includes a power unit (12) having a rotatable shaft (18). An impeller, which may be a screw impeller (20) is coupled to the shaft and includes a blade (50) having a generally uniform outside diameter. A diffuser head (16) is positioned proximate the impeller, and may have two stepped portions (36, 38). The impeller may be positioned within a tubular member (46), extend to above such member, and terminate below the head.
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