When Bio-Pappel, a New Mexico paper and packaging manufacturer needed a reliable level measurement solution for their foaming wastewater processes, they turned to Flowline. At the time, Bio-Pappel had tried just about every level sensing technology with disappointing results. Contact sensors such as pressure and floats, were affected by the material build-up associated with glue, resin and paper particulate, or corrosion attack from bleach. The thick surface foam also affected non-contact ultrasonic sensors, and a stand-pipe installation was not possible due to the material build-up. For these reasons, Flowline suggested the use of non-contact pulse radar which is unaffected by most process variables including surface foam.