1.Through 8-layer filtering; 2.High quality,passed 11 certification; 3.After good after-sales service; 4.Offer OEM ... Turns water sweeter and increases water PH to mild alkaline to match the body's ph balance of 7.2-8.5 ... Stones Functions:Creates magnetic field to further break water clustersPass 11 certificationsNSF, Water Quality , FDA&EPA, Fresenius, CICS,SGS,KDF,etc ...