NOVELTY - The polymeric hollow membrane for fuel cells, comprises two end layers separated one another by a space, capillary tubes arranged between the end layers, and an opening at a level of the end layers to form fluid flow canal. The space between the tubes and the end layers is useful for forming an internal cavity of fluid circulation around the tubes. The end layers and the tubes are made of unitary polymeric structure. The capillary tubes (105-5x109 per cm2) have a length of 5-60 microns, and an internal diameter of 0.05-10 microns.    USE - Useful for fuel cells to fight against environmental pollution by purifying gas furnaces or by treating wastewater and organic material to extract the desired fluids containing several components, and medical devices such as blood oxygenators and artificial kidneys.    ADVANTAGE - The membrane has optimized surface and reduced parasitic pollution.    DETAILED DESCRIPTION - The polymeric hollow membrane for fuel cells, comprises two end layers separated one another by a space, capillary tubes arranged between the end layers, and an opening at a level of the end layers to form fluid flow canal. The space between the tubes and the end layers is useful for forming an internal cavity of fluid circulation around the tubes. The end layers and the tubes are made of unitary polymeric structure. The capillary tubes (105-5x109 per cm2) have a length of 5-60 microns, and an internal diameter of 0.05-10 microns. The polymeric structure has a thickness of 0.1-3 microns. The capillary tubes are disposed perpendicular to the end layers with respect to an angle of 0-45degrees. INDEPENDENT CLAIMS are included for:    (1) a preparation of polymeric hollow membrane;    (2) a fluid treatment module;    (3) a fluid treatment method; and    (4) a method of manufacturing a fluid treatment module.    DESCRIPTION OF DRAWING(S) - The diagram shows the hollow membrane.    Two end layers (12a, 12b)    Capillary tubes (14)    Internal cavity (16)    Openings (18a, 18b)    Homopolymer microsphere. (20)