Built for larger capacities, BIODEC^™ S 300-600 series delivers the same simplicity, reliability and endurance found in the compact units. Designed to handle large flows, this series of BIODEC^™ decanters is unique in its construction. Two parallel welded tubes, known as floats, make the bulk of the floating body wherein the upper and lower floats have remarkably different functions. The lowest level the decanting head can go is set by a fixed length of chain. The highest level the decanting head can rise is set by a bumper. In case the water rises above the set level the decanting unit works as a safety spillway as well. The compressed air at low pressure (max. 0,05 bar) is regulated by a motorized three-way ball valve.