QSB Features: 1. Well-knit structure, less land occupation, convenient installation; 2. The other parts operated below the water except the inlet, the yawp was small; 3. The air inbreathed was much, produced the bubble much and close, and the rate of oxygen was high; 4. Provided the air without headstream, left out the blower, and the cost of project was low; 5. Introduced the Germany technology, the impeller used the no-jam, and operated safe and reliably.