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Do you mean I'd have to seperate the cal/mag to use both calimagic and epsom together? Unfortunately right now I only got the calimagic and flora trio so can't seperate cal and mag.Your well being 40ppm is basically equal to RO for most.
I would assume whatever it is that makes up 40 is insignificant as far as feedings go.
I would do your mixes with 40 being zero in my mind and mix to your chosen number plus the 40.
I have found with LEDS that mag deficiencies are common, but easily managed.
I would to have separate Ca and Mg.
My experience is Mg is needed to be supplemented more often than CA so adding both is not always better.
And yeah man 40ppm is negligible I guess. I could probably go a bit higher with the calmag in veg as I still had a little mag def here in there. Like you said LED's seem to give more mag def. I wonder what spectrum LED's are missing that causes this mag deficiency? THere's probably a chart somewhere that shows it.













