Solids and wastewater from residential septic tanks must periodically be removed and transported to a wastewater treatment plant for processing. While awaiting treatment, the waste is typically stored in a sludge tank, the level of which must be continuously monitored to prevent drying up or overfilling of the tank. A new white paper from flow and level measurement experts KROHNE illustrates some the challenges with measuring sludge and discusses how the company's OPTIFLEX meter overcomes them.