This system reduces chlorine taste and odor, cysts, particulate, lead, mercury, benzene, toxaphene and P-Dichlorobenzene down to 0.5 micron. The filter cartridge is tested & Certified by NSF International with NSF/ANSI Standard 42 and 53* Flow Rate (metric) : 2.8 Litre per minute Micron Rating : 0.5 μm