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I live in Tennessee. I've been using the Taylor Test kit since I found TFP. Is there a water temperature where the test results become invalid?

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...