Extremely fine filtration to 0.5 microns reduces a wide array of contaminants proprietary fibredyne technology provides minimal loss of water pressure, even during times of high consumption unique filter enables 2x the flow efficiency of comparable competitive lead filters Built-in bypass means no disruption to water flow during cartridge change-outs NSF, ANSI Standard 53 certified to reduce lead and cysts such as Cryptosporidium and Giardia by mechanical means. Undesirable contaminants such as lead and cysts can exist in water sources or pipes outside your home and can cause a variety of health issues. Lead is often one of the most talked about water contaminants in the media and because of its use in common household products like paint, pipes, ceramics and others, it is still widely found in residential home''s water across the country. With a Pentair whole house heavy-duty lead system, you can enjoy worry-free water with fewer harmful effects of lead at every tap in your home.