This Premium replacement filter pack includes one 5-micron sediment filter for the reduction of sand, silt, sediment and rust, as well as one premium 1-micron coconut shell carbon block for the reduction of parasitic cysts, lead, chemicals, chloramine, chlorine taste and odor. The U.S. Environmental Protection Agency (EPA) estimates that VOCs are present in one-fifth of the nation's water supplies. Over 700 synthetic organic compounds have been identified in various drinking water supplies across the United States. These contaminants include items such as herbicides, pesticides, insecticides, disinfection by- products, as well as chemical and industrial sources. When used in the Watts Premier Under-Counter System, this filter pack is NSF Certified for the reduction of a long list of volatile chemicals as well as lead and cysts like cryptosporidium and giardia. It fits all standard two-stage water filtration systems. Reduce your environmental impact: Using these Watts replacement filters with your water filtration system can save over 9,000 half liter bottles going into landfills per filter change-out. Coconut shell carbon is a renewable resource compared to coal. Coconut plantations with millions of acres continue to provide all the benefits of green trees to our environment, in spite of using coconut shell for activation. Superior contaminant reduction is achieved through the use of these certified coconut shell carbon blocks.