Past couple of years I had subscribed to the pool math app so I could keep long term tabs on pool's history. I've discontinued my subscription since I rarely need to look back in depth. The TFP method has made my pool surprisingly stable. I'm guessing that since I won't be able to keep more than the last log now and my app still has it's history, I need to delete the history so I can record the latest log? It's not allowing me to record anything without renewing my subscription right now and don't see an option to delete the history without deleting the whole pool. Can anyone tell me what I'm doing wrong?