The use of antibacterial filter media is one of the methods employed for removal or elimination of pathogenic micro organisms in filtration of liquids. The advent of nanotechnology and introduction of nano fibre based membranes with unique properties has revolutionized adsorption based separation filtration technique. As far as effective filtration is concerned, the important properties offered by these filtration media are includes, high specific area, internal pore continuity and chemical affinity at nano scale. Electro spinning of fibres with diameter in the range of 100 to1000 nm are generally used in the production of these types of filter media. In the present work polypropylene composite fibres containing nano silver particles were produced using melt electro spinning technique. The nano silver particles were added in form of master batch to the polymer melt. The produced nano fibres were employed in production of multi-layer membranes with thickness of 140 and 1200 micrometers. In order to define the ideal membrane, effect of influential parameters such as proportion of the nana silver particles in the polymer melt and membranes thickness were investigated. Results have shown that, particle distribution along the fibre axis is acceptably uniform. Gas permeation fluxes and effective surface porosity of the membranes were determined using gas permeation test method for dried membranes. It was found that an increase in the number of layers reduces the average value of the pore diameter which in turn improves filtration efficiency. Finally it was concluded that, the ideal membrane can successfully be employed in vast applications in the filtration of liquids