Its not Ph. And I have multiple meters as well as drops. But I will quintuple compare. I have 5 other strains on the same rez including the JayPlantspeaker SD and everything else is looking great.Calibrate your ph pen, and could need more nitrogen. Ph calibrate your pen n let us know
EDIT: I checked my trusty Hanna meter and it matches an old Blue lab which is still check marked as cal both reading 6.0. GH drops are reading 5 or so light orange which is also what I usually get at hight 5's. It will go yellow above 6 then greenish yellow as it aproaches 7.0. I will check with drops again tomorrow. I am getting drift upward but that is normal for me with the added silica blast. I also have some pool test strips I will check tomorrow when I add cal hypo.
I've been flushing every 10-14d this run with salt.
RH 46-58
Temp 71-81F night to day
Might just be from the stretch. They have leveled off now at 3.5w.
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