Hi everyone...new to this site. I was reading these post about the vinyl liner feeling like sandpaper. I opened my pool to the same situation yesterday. My PH was very high and I am in the process of lowering it this very minute. My liner is only 3 years old and I have never had this sort of issue before. If lowering the PH doesn't work, is there anything else? Any help you can provide is greatly appreciated. I am a little upset over this and I want to be as educated as possible if I end up calling a pool company in.