Exploring the full range of areas required of water and wastewater plant operators, this volume provides the basic knowledge needed for certification, licensure, and improved job performance. Checkpoints, self-tests, and a final examination with questions based on actual operator certification exams provide a thorough review. Clearly illustrated key ideas and highlighted points provide information on pump fundamentals and applications, and introduces preventive maintenance and troubleshooting for hydraulic pumps. It explains centrifugal and positive-displacement pumps and covers common problem areas and corrective actions, such as maintaining packing and mechanical seals.