| 摘要 |
<p>A retractrable mixer system and a method of using the retractable mixer system to clean sludge build-up in a tank is disclosed. The retractable mixer system includes a drive shaft, a retractable propeller assembly and a motor for rotating the drive shaft and the retractable propeller assembly attached to the drive shaft. By using the retractable mixer system at an existing access point or a newly created access point, the sludge build-up may be cleaned even when the sludge level is above the access point.</p> |
