In the area of compressed air purification, coalescing filters are used to separate liquid water and oil from compressed air using a coalescing effect. These filters additionally remove particles.The main function of coalescing filters is to trap and subsequently remove liquid oil and water from a compressed air or gas stream. The secondary purpose is to remove particulate matter. Filtration of oil,water aerosols,dust and dirt particles to 0.01 microns, the best achievable in industry.