Hach Co., of Loveland, Colo., introduces the new OptiQuant Sludge Level Monitor for accurate, full-time, unattended sludge level monitoring. The system requires minimal maintenance and no sample conditioning, making it a productive choice for many applications in the wastewater treatment process. Full-time monitoring with the monitor enables plant operators to optimize the extraction of recirculated sludge, compensate for normal fluctuations and correct for extreme conditions.