Hydronix SPC series 2.5" x 10" 50 micron polyester pleated cartridges are manufactured from durable polyester to provide you with a superior pleated Filter that is washable, reusable and durable. The SPC series pleated filters are chemical and bacteria resistant, have a great dirt holding capacity and extend the time between Filter changes. Hydronix SPC series polyester pleated cartridges are suitable for a variety of uses and can be used in residential, commercial and industrial applications. The polyester media is pleated around a polypropylene core for added strength and the ends are immersed in a Thermos setting vinyl plastisol. Embedding and sealing each end of the Pleat in this fashion fuses the three components together forming a unified end cap and gasket.