Sewarage Equipment business category Envitech also involves in the manufacturing of wastewater treatment equipment such as the Envitech Recirculation Activated Sludge (RAS) Pumps, IDEA Syphon Decanters and Hydrojet Aerators. Envitech Recirculation Activated Sludge (RAS) Pumps IDEA Syphon Decanters Hydrojet Aerators