This listing is for two filters.Features:Fits in all standard 10" filter housingsAmount of Carbon: 10.5 ozAmount of KDF: 8 ozKDF media removes lead and free chlorine.KDF media is bacteriostatic. It inhibits bacteria growth from within the cartridge itself..Premium Coconut Shell Granular Actived Carbon is effective for chlorine, taste & odor removal.Cartridge uses a combination of Granular Activated Carbon & Patented KDF Media.This cartridge contains a patented media, KDF (U.S. Patent 4,642,192) which has been tested to have bacteriostatic properties in addition to effectively removing Chlorine, Lead, Arsenic, Cadmium and other contaminants that may be present in the water.This cartridge should be installed with the gasket end against the screw cap. Be sure to check your flow direction. Remove the outside wrapper before installation. After installation, the filter should be flushed with sufficient water to remove all traces of fines.