A submersible sewage pump works below the liquid level, so it never needs priming and the surrounding liquid keeps its sealed motor cool. A non-clog impeller lets solids pass through instead of jamming the pump.

A submersible aerator uses the same sealed, underwater design for a different job: a jet draws in air and breaks it into fine bubbles, mixing and oxygenating the tank without a separate blower. Evergush builds both families in Kaohsiung, Taiwan, and Water Exchange supplies them for ETPs, STPs, sumps and fish farms across Bangladesh.