... the regulation of water hardness9. Showing filter life10.Colorful display, PH value indicatorSecond:Functions introduction1. Automatic reversing electrode, cleaning ... calcium, zinc and other trace elements.3. Keep PH value of water bettween 4.0-9.7, exquisite ... , LED, LCD sound and light controlling , color tips8. Display flow automatically, custom water, alarm9. Automatic over-current protection10. ...