My EC meter says that it is factory calibrated, or pre-calibrated. It’s like a $20 EC Meter, so maybe it still needs calibration or something. I was squinting at it and wondering why it said that and figured you all just add your own decimal (first time ever using one).
Hmm, all I can say is that I either 1) have a bad EC (cheap model), 2) it needs to be calibrated (even though it said it was factory calibrated), or 3) I need to re-read the directions.
Ok, so the 5g/gal Maxibloom mix has sat for a few hours. I double checked the EC meter instructions again and did another reading. This time 735ppm and EC 1556. Seems to make more sense compared to my original reading.
Eh. I ended up springing for a BlueLab EC meter.
I have two cheapo ones and they were both reading within a few points of each other, but who knows. If everyone here thinks that we're looking at ~.26EC per gram, that works for me to calculate where things are. My water is a bit of a mixed bag since some times of year it's ~220ppm and other times its closer to 300PPM, etc. I usually discount my water's native PPM/EC since I don't think much of what it carries to be bio-available (As proven by having calcium & magnesium deficiencies when I'm not being super careful).
Eh. I ended up springing for a BlueLab EC meter.
1.556 EC is what you have there.
I measured 950PPM (1.9EC) in my tank.
Yeah they’re definitely dosing for bigger commercial grows, I’d imagine you could push pretty hard in one of those fancy multi million dollar corporate grow facilities.
I also consider the fact that these charts aren't necessarily 'cannabis specific.' Lots of things that people grow with this stuff...and some plants (like hot peppers) can be heavy feeders. We're just used to only thinking about one plant.
You're water is .66 EC?
It's well water, and while that suggests lots of Ca/Mg, I've been hit with deficiencies of both.
Consider getting it tested?
I've laid eyes on a test before, when we bought the house, if you think I can lay hands on that test now...that's a different story. Right now the well is sort of at its high point, late summer/fall it ends up around 220ppm or so. Checked my res this morning for the blumats, and depending on what cheap tester I use, it's either 840PPM (1.68EC) or 950ppm(1.9EC).
Oddly, I refilled my 1g bottles with unsoftened water from the well today and the EC was sitting at .44 (which is our apparent baseline), when measured with both meters. I won't have the BlueLab meter until Friday and I'll check then as well. I wonder if having heavy rain yesterday changed the end composition of the water, though our well isn't shallow and we've never come close to running dry in the 6 years we've been here.
You really don't need to ph in soil when it's that close, it'll raise within a short time after being applied to the soil anyway.