The invention relates to the technology of separating liquids and gases, and specifically to removable cartridge filters for purification of a milk product. A filter element for fine purification of raw milk is made in the form of a tubular cartridge of food-grade polymeric material. It is formed as discrete rows, obtained by the aerodynamic extrusion method, of fibres with pore sizes decreasing in the radial direction from the periphery to the centre. Each row consists of framework and filtering fibres. The thickness of the filtering fibres is greater than that of the framework fibres, and the invention allows milk product purification quality to be improved.