Lbgrower
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Is 2.5ec not like 1000ppm + ?? And are you not in coco? Sounds crazy high and I've been overfeeding
And in my case I didn't see deficiency / excesses until week 5-6
Check page #1 on this thread it has the conversion chart. I've been feeding 2.5 ec for the last three applications and they're looking good. I feed feed flush that flush is with 1/4 strength base nute and 1/4 strength cal mag.
Anyway 2.5 ec is around 1750 ppm