Water droplets are formed by the condensed water vapor present in the ambient air. Solid particles come from ambient air contaminants like dust and from rusted, oxidized pipework. Liquid oil and oil vapors are introduced by compressor coolants and hydrocarbon vapors present in ambient air. Because FHP Series Filters offer 5 Grades of high pressure filtration, you can count on the quality removal of water droplets, solid particles, oil and oil vapors within your compressed air system. The high pressure filtration in the FHP Series will meet the needs of both the application and the environment in which you are in.