An amorphous potassium aluminosilicate filtration media which may be mixed with activated carbon filters water to remove oxygen, chlorines, hardness, alkalinity, ammonia, hydrogen, hydrogen sulfide, sodium sulfite and other contaminants. The particular sodium aluminosilicate is a porous amorphous material formed under ultraviolet light or sunlight to produce pore sizes of 60 Å to 250 Å at ambient temperatures (20° C.-35° C.) and low relative humidity (5%-20%). The media is initially formed as a microporous primarily amorphous gel containing Na2O, Al2O3, SiO2 and H2O. The sodium therein is displaced by potassium, whereby the filter removes impurities from water without introducing sodium. The potassium aluminosilicate may be a second stage filter to a first stage filter composed of a strong base anion media charged with potassium carbonate and/or bicarbonate. The filtration media may be used in any type gravity filter including that in an inverted bottle type dispenser for filtering water the flowing from the bottle to the spigot and also filtering air which bubbles back into the bottle in response to opening the spigot. The media as blended with activated carbon may be composed of molded particles having diameters from 1 to 100 microns and preferably 1-20 microns with an average diameter of about 10 microns. It also may be blended with zirconium oxide without carbon for reducing anion and cation species from drinking water.