activated carbon,coconut shell carbon,Nut shell carbon with iodine rate to remove VOCaaS, pesticides, chlorine, odor & test & se Carbon block cartridges are designed for high ... from potable drinking water. Filter Media:Activated Coal Carbon/Coconut Shell Carbon/Nut Shell carbon with high iodine rateGasket:Silicon,EPDM,NBR Maximun ... Outer/Inner diameter:2.5”,4.5” /28mm carbon block filter cartridge