Outside-in model UF membrane core (UF filter element) for 20inch Cartridge FilterThis membrane core is designed for common Outside-in Filter housing. 10inch cartridge20inch cartridgeFiltration model Outside-inMembrane material Hydrophilic PVCFiltration precision 0.01micron (10nm)Bacteria & virus removal >log4Membrane lifespan 2 3 years depends on water qualityFlow rate 60 90L/hr, 1 1.5L/min120 180L/hr, 2 3L/min