A filtration medium for the purification of a liquid or a gas material includes a mat having a first surface and a second surface in which at least one of the first surface or the second surface is substantially non-planar. The mat comprises a foamed resin 5 having a density of about 1 lbs/ft3 to about 3 lbs to ft3 and/or an indentation load deflection of about 35 lbs to about 150 lbs. Methods of filtering a gas or liquid material using the filtration medium are also provided, as are methods of fabrication of the modules.