The Crystal Quest Nitrate Whole House Water Filter is meant to removes sediment, silt, sand, and dirt. Water flows through a 20" solid carbon cartridge for removing volatile organic carbon compounds (VOC's), & any remaining insecticides, pesticides and industrial solvents. Water flows through a Nitrate reducing mineral tank and brine water conditioner. In addition, we add our media, ERA® 6500 & 9500 to prevent bacteria growth.