I have used the Pool math app since last summer and I recently upgraded to the paid version. I have two questions: I can save my results but 1) if I make a mistake I can't see a way to delete an erroneous save, and 2)most of what I've entered doesn't show up when I reopen the app. That is, it remembers my pool size, type of sanitizer, and bottle size but nothing else. The first page doesn't ever show me FC, CYA, etc. levels even though I just saved them. What am I doing wrong? John T.