The air we breathe contains contamination in the form of water vapour and airborne particles. During the compression process an air compressor concentrates these contaminants and depending on the design and age will even add to the contamination in the form of oil carry over.
Modern air compressors generally have built in after coolers that reduce the discharge temperature of the compressed air and with the help of water separators, remove the bulk of liquid water.
In some applications this may be sufficient, but the remaining dirt and moisture content suspended in aerosol form, can, if not removed, damage the compressed air system and cause product spoilage.
Air Contaminants lead to increase down time and reduced productivity. it lead to corrosion , damaged Tools , poor finish to painting Jobs etc .