The document describes the Accelator® Clarifier/Softener product from Infilco Degremont. It is a solids contact clarifier that uses internal slurry recirculation to provide high-rate treatment in less space than conventional systems. Key features include high quality softening and clarification, industry-leading installations, internal recirculation of sludge, and efficient use of chemicals. It operates using a rotor-impeller to mix and circulate slurry through four zones - primary mixing, secondary mixing, dynamic solids separation, and internal sludge concentration - in a single basin unit.