... , water regulates current flow. 2,Strong largecapacity electrolysis, automatic reversing electrode, cleaning electrobath automatically.3,Keep PH value ... of water bettween 4.5-9.5. 4,Automatic tips for filter replacement 5,Add function by calcium, zinc and ... color tips 7, Colorful display , PH value indicator 8,Automatic over-voltage over-current protection. 9,Original five-filtration system ...