Hust17
Well-Known Member
Yupppp. Its been sooo cold for about a week now but it’s supposed to be around zero for the coming days. Phew, almost froze to death a few times!!
What are your nute PPM levels everyone?
- Thread starter jointmcfatty
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70's natureboy
Well-Known Member
That's what throws everybody off. We don't know if people are talking in .5 ppm's or whole ppm's. That's where the math comes in.
SuperiorBuds
Well-Known Member
If you read the docs for most PPM and TDS meters they say that the reading is an estimate. That's because they are actually measuring EC and then doing the multiplication internally. Since EC is what you're actually reading, it only makes sense to use that as the data point. (And not some made-up number that gets you "close" to expensive sensors.)
DailyBlastin
Well-Known Member
just wanted to come back to update- after being urged by many to measure in ec rather than ppm i finally did, turns out my 1200+ppm solution was 1.9ec and that high concentration was pushing my ph down. refilled my res last wednesday and set to 1.3 ec, ph has stayed perfectly stable at 5.9!
Keesje
Well-Known Member
Nice!
What you experienced is a good example of how things can get fucked up.
Apparently your meter uses the 0.64 scale.
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icetech
Well-Known Member
I have always had bad ph swings myself and lately have switched from 1000-1050 down to 700-800 and my ph stays much more stable
I think i'm at 1.4ec.. haveonly started using ec myself a few days ago..
Keesje
Well-Known Member
That General Hydropinics uses it, is a good reason to keep on using it. Would be better if GH would use EC as well. Or at least all the ppm scales.
The other reason (smaller changes) is invalid, I think.
Because ppm is just a 'translation' of the EC your pen is measuring. So I would not know how it could be more precise.
kingromano
Well-Known Member
depending on your rh and the temp in your room your plant will need a different EC
more they transpire ( high vpd) and lower the ec must be
usualy makes from 1.2 to 1.6 mS in bloom
more they transpire ( high vpd) and lower the ec must be
usualy makes from 1.2 to 1.6 mS in bloom
icetech
Well-Known Member
That flowing solution is the issue.. even in my DWC i have to turn the airstone off or i get numbers bouncing around.. i would find something you can block the flow from hitting the pen while you do a reading and see if it works better.
im in flood and drain, and my blue lab monitor in my res. dont bounce around, it will stay put, or slowly drift in one direction. as soon as it moves i know what direction its going. if it s moving up...too strong, if its moving down...too weak or sometimes i'll call that close enough.
SuperiorBuds
Well-Known Member
1.02EC
Your meter is reading EC and doing the math internally -- it's not actually reading PPM.