How Can Bypass Filtration Units Revolutionise the Plastic Moulding Process? Every manufacturer within the Plastic Moulding trade knows that machinery breakdowns and the associated costs and downtime are a huge burden for the industry and their profits. Injection moulding equipment is found in factories manufacturing everything from wheelie bins, to car parts and lawnmowers. One major factor in machinery breakdown can be dirty oil in the hydraulic system; causing inefficiency, blockages and failure. This leads in turn to lots of down time and repair costs. Breakdowns and inefficiency due to poorly filtered oil is a widespread problem.