Modern wastewater treatment plants are judged by two yardsticks: the quality of the effluent and the size of the electricity bill. The twin-impeller side-channel blower, epitomised by the 2LG720-7HH26, addresses both challenges in a single, compact package. With two dynamically balanced impellers mounted on one shaft, the unit behaves like two blowers in series, generating a continuous, pulse-free flow that dissolves oxygen far more efficiently than conventional single-stage machines.