The Pentek R30-BB filter cartridge pleated design maximizes dirt-holding capacity while being versatile and reusable. The R30-BB uses a durable polyester media that is bacteria and chemical resistant, so it can be used on chlorinated or non-chlorinated water supplies. The Pentek R30-BB water filter media is pleated around a polypropylene core for added strength and the ends are immersed in a thermo-setting vinyl plastisol, this fuses the three components together forming a unitized end cap and gasket. The overlap seam is sonically welded to reduce internal bypass, thus improving filtration efficiency. The media is pleated to maximize dirt-holding capacity and extend the time period between changes or cleaning. R Series filter cartridges are resistant to both bacteria and chemical attack making them suitable for a variety of residential, commercial applications.