Our polypropylene pleated graded density filter cartridges featuring APT construction for extended filter lifetime 3M purification's Betafine PBG series filter cartridge, formerly known as PolyPro XL, represents a major advance in pleated polypropylene filter design and performance. Our advanced pleat technology (APT) construction combines - up to 50% more filter media (surface area) than competitive filters. Graded density media for optimum contaminant holding. New cartridge design for increased flow and reduced pressure drop the result is a filter cartridge that lasts longer, performs better and saves money our Betafine PBG series filters for food and beverage applications are available in the following versions, model PEG - without stainless steel insert, model PBG - with stainless steel insert, model PTG - with factory certified integrity testing, model PBP - (multi layers) for final filtration or for membrane protection. The APT advantage surface area dictates just how long a filter will last and how it will perform. However, increasing surface area without considering the flow path between the media's pleats could result in flow restrictions and early media blinding. To achieve the optimum between surface area and performance, 3M purification has designed betaine PBG series so that our pleating process and media support materials work together to provide enhanced flow characteristics and longer service life.