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Does anyone have experience with older bottles of Mammoth P? I purchased a bottle about a year and a half ago. I had to shut down the grow before opening the bottle, and am now just back to the point of needing it again. Still viable? From what I have read it should still be good, but I’m looking for someone that has experience using some that is this old. The bottle is still sealed and has been in the dark in a temperature controlled room.