Synder Filtration offer membrane filtration technology. Liquid filtration, in the most basic sense, is the separation of a mixture. Synder Filtration's medium for such separations are polymeric membranes. Spiral Wound Membranes serve as a thin barrier between fluids, which allows selective transport of certain molecules. When trying to achieve targeted separation, matching the membrane with the correct pore size for a given molecule, or molecules, is very important.