Profile: Fileder Filter Systems Ltd. specializes in offering process filtration and water treatment services. The spectrum FS filter sleeves provide re-usable surface filtration, and fit into all conventional 10 inches housings. Water treatment cartridges can remove a wide variety of contaminants, ranging from heavy metals and nitrate to iron and scales. Also used in water softening and high-purity color change de-ionization water treatment, cartridges go one-step further.