The Ametek/Pentek WPX50BB97P water filter cartridges are constructed of fibrillated polypropylene wound on a polypropylene core. The fibrillated polypropylene should be used when pressures require minimization of extractables and/or fiber migration. The Ametek/Pentek/USFilter WPX50BB97P water filters reduce sediment. sand. and silt.SpecificationMedia – String Wound PolypropyleneMicron Rating (Nominal) – 50Operating Temperature (°F): 40 – 165Operating Temperature (°C): 4.4 – 73.9Flow Rate (gpm) – 30Flow Rate (lpm) – 113.562