This meter offers real-time knowledge of silt, slurry and sludge concentrations in pipes, tanks and clarifiers. It allows users to program underflow pumps to shut off before biosolids or feed solids density becomes too thin, and to optimize polymer dosing and equipment variables for enhanced dewatering. The non-intrusive inline pipe spool-piece sensor uses ultrasound to provide continuous readings, unaffected by color, and it may also offer early awareness of breaks in filtration material.