Membrane Filter Dryers is used as a polishing filter. It is a bundle of hollow membrane microfibres. The compressed air is used to passed through these hollow fibres, and the water vapour and carbon dioxide is removed by the principle of selective permeation through the membrane fibre wall. The length of the exterior of the fibre bundle is to carry away the impurities and return it to atmosphere. It is a self contained compact, robust and lightweight compressor and pump packages.