It's good to be aware of elemental PPM when you're reading lab reports, but almost everyone online is working in K2O and P2O5. At least I think they are. Someone please tell me if they aren't, hah.
That's really the problem I am facing, I worked out the ele ppm of dry salts, but nobody else is talking in terms of ele ppm. That's obviously my own fault. I just rather work out what's going in, than constantly depending on meters that can drift or give wrong readings depending on temps. I know meters are suppose to compensate for that, but again, more things to go wrong imo.
N 64 + 75 = 139
P 63 + 22 = 85
K 90 + 29 = 120
C 95
M 30 + 25 = 55
S = 32
The overall max ele ppm at any time, including micro nutrients does not exceed 600 elemental ppm (as far as I am aware). I am attempting to use blumats again with no run off so trying to get a base line of what other people use in similar situations. One guy I found is doing insanely good with timer feeding and no run off, he estimates his EC is between 1.4 to 1.6.
My base is 1.2 ec at 1g/l, according to the manufacturer (gotta trust something). 0.5 gpl of cal nitrate and 0.25 gpl of mag sulph, along with 0.10gpl of mkp, is probably pushing over 1.6 ec, but I just want to know where it's at.
N and C are reduced as P and K are increased in mid flower, so realistically the ppm is going to be closer to 520, if the above calculations are correct. I'm just wanting a rough idea so that I know I am safely within range, and to double check I didn't mess any calculations up. S is low by what I've read, 60 ppm is the better spot, but that's another thing.