The Goldline 5-Stage RO System 50 GPD contains a 5 stage RO purification technology that can eliminate 99 percent of the contaminants in your drinking water. It involves water purification at five stages. At a first stage, the pre filter will identify microscopic elements that can be smaller than sands. Then the second stage, the activated micro carbon filter will provide proper taste to your water by removing chlorine and bad odor and this process will continue till the third stage. The stage four involves purification with RO membrane cartridge with 50 production capacity that can squeeze out substances dissolved in water. The last stage involves post filtration with inline GAC post-filter that give extra clearness to the water. It has a steel tank that can deposit 3.2 gallon water. Together it offers lead free faucets and installation kit per pack. The cartridge is certified by the water quality association, America with NSF/ANSI 58 Gold Seal.