... noise Construction The wastewater grinders are assembled by motor, reducer, gear box, cutting chamber, drums,mechanical seal, ... the space between cutters, side rails and drums. Materialsl Cutter and spacer: heat-treated alloy ... and Housings: Ductile cast iron ASTMA 536 l Screening Drums: • Standard: coil made of stainless steel: 304 ... l Authority setting function Double drums wastewater grinder