Abstract: The present invention discloses a filter system for the filtration of residential tap water for drinking. The device of the present invention removes impurities including organics, heavy metals, and nitrates, and it provides a removable filter which can be readily changed without disconnecting the water lines. The filter in its simplest form has a central filter cartridge which is connected to a top cap and a bottom cap. The top cap and bottom cap have a water inlet and outlet, respectively. The central filter cartridge in turn has a conduit, which is terminated with restrainers, forming a central cavity in the central filter cartridge. The filter cartridge is filled with granular material for filtering. Particulate filters are positioned between the granular material and the restrainers. In one preferred embodiment the particulate matter forms a bed of a silver impregnated activated charcoal, a bed of a cation resin, and a bed of an anion resin.