Hi, I am having some problems with my gunite plastered pool. I have a salt system and no matter what I do, I can not get my ph below 8.2. I can add acid to the pool and get it to 7.6 for 1 day, the next day it is at 8.2. My plaster is getting very rough and I am finding my polaris bag full of what looks like white sand. I am leary of adding more acid. All my other chemistry is in balance other than my ph which is 8.2 My plaster is less than 1 year old and I am afraid it si ruined. What is happening? I never had this problem with my first pool which was plaster but I always used chlorine tablets. What is going wrong?