pH rises naturally due to CO2 (carbonic acid) loss in solution. You stated you keep your water for at least 3 feedings. Some of that water is going to naturally evaporate and the carbonic acid with it, hence you’re seeing a rise in pH.
I have 2 seedsman seeds white widows in flower along with a sweet seeds green poison. I also popped 4 purple lemonade FF from FastBuds about 2 weeks ago.
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