I just replaced my Aquarite system with a new Aquarite Pro with Sense and Dispense with acid feed and the installer was trying to tell me how I needed to keep the chemistry for the system to work correctly. Well I am totally confused now. He told me that I need to keep the PH at 7.4 and the Alkalinity at 50 and the CYA at 0. At those numbers my CSI will be -0.6. I have always had my PH at 7.7 or 7.8 and Alkalinity at 60 or 70 and CYA at about 40. Is he correct? I am trying to learn how to read the ORP in Mv and how to keep my pool balanced. Current Aquarite Pro read out is 700Mv, PH 7.4, Salt 3800. I have seen variations in the Mv range from 650Mv to 750Mv at different times of the day.