automation of ph

My pool has now been filled for 2 years and I am still fighting an elevating PH. I constantly get a PH at about 8.0-8.2 and add enough MA to get it down to 7.6, then 3-4 days later it is back to 8.0. I even checked it the next day to be sure what I was adding is working, and my PH was where it...