Because of additional developments in metal machining processes using non-water-soluble coolants, the requirements for coolants and their treatment are continuously expanding. Higher machining speeds, higher coolant pressure (100 bar and more) and heavy-duty oils with low viscosity require new, innovative solutions as well, in the field of extraction technology. For example multi-spindle processing, grinding, milling (rough grinding) and deep-hole drilling are included in the critical machining processes where micro-aerosols are created. The very finest coolant aerosols in the range of 0.4 µm cannot be separated with conventional technology.