The Filtrex VOC Series GreenBlock Filter, FX20VOC is a great way of improving the quality of water. It offers a high capacity of 20,000 gallons. This carbon filter aids in removal of impurities like lead, VOC?s, chlorine, bad taste and odor. It features a drop filter rate of 5 microns and a flow rate of 2 gpm. It has been manufactured using a patented process that allows it to reduce the harmful effects of Green House Gas Emissions. Its dimensions are 2-1/2" x 20".