Pentek FLOPLUS-20BB High Flow Carbon Filter: The Pentek FloPlus20BB cartridges utilize a revolutionary new technology that significantly enhances the traditional Fibredyne product. The Pentek FLOPLUS-20BB water filter is ideal for users looking for a product that offers high flow, low pressure drop, infrequent cartridge changes and cyst-free water. Maximum life—dirt-holding ability of a 10-micron carbon block with the particulate efficiency of a 0.5-micron cartridge. 99.95% reduction of Cryptosporidium and Giardia cysts. Pentek FloPlus-20BB water filter cartridge 455906-43 has outstanding chlorine taste & odor reduction. High flow rates and low pressure drop similar to a nominal 10-micron cartridge. The Pentek FloPlus-20BB water filter is Tested and Certified by NSF International to NSF/ANSI Standard 53 for the reduction of Cysts. NOTE: The Pentek FLOPLUS-20BB cartridges will contain a very small amount of fines (very fine powder) and new cartridges, after installation, should be flushed with sufficient water to remove all traces of fines from your water system before use.