Zen Water Systems 5S-F 5-Stage Mineral Filter Cartridge Effectively eliminate bad odor, chlorine and hundreds of man-made chemical such as pesticides, solvents and VOCs found in tap water Replenish drinking water with essential minerals and bio-energy properties while remove toxins and impurities Silver impregnated carbon contains natural antimicrobial properties to inhibit bacteria growth and purifies drinking water Life of filter is 500 gallons or 6 months, whichever comes first Guaranteed to fit across all Zen Water models; Be sure to use only genuine Zen Water replacement filters for optimal performance