phxazcraig
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Except it's not, for me. Look at the readings I posted. PPM at 800, but EC much higher than 1.6. I'm not seeing a direct conversion here. I typically hit an EC limit well below the PPM limits (on the FoxFarm chart, which gives recommended ranges for each week(..5 EC is equal to 250ppm. So .1 EC is 50 ppm
What type of meter? brand?Except it's not, for me. Look at the readings I posted. PPM at 800, but EC much higher than 1.6. I'm not seeing a direct conversion here. I typically hit an EC limit well below the PPM limits (on the FoxFarm chart, which gives recommended ranges for each week(.
Different meters are on different scales. Most ppm pens around here are on a 500 scale. The chart you are looking at is on a 700 scale.Except it's not, for me. Look at the readings I posted. PPM at 800, but EC much higher than 1.6. I'm not seeing a direct conversion here. I typically hit an EC limit well below the PPM limits (on the FoxFarm chart, which gives recommended ranges for each week(.
Thanks @growsince79 I was never gonna get that lmao I was feeling out of my elementDifferent meters are on different scales. Most ppm pens around here are on a 500 scale. The chart you are looking at is on a 700 scale.
Different meters are on different scales. Most ppm pens around here are on a 500 scale. The chart you are looking at is on a 700 scale.
Well, that explains it! But it means PPM needs to be stated along with the conversion factor to have any meaning. I'll be going by the EC reading. Thanks!
So you're basically saying to ignore readings, let something go wrong, then diagnose my plants and take corrective action? My readings aren't off, they are just on a different scale, like bass clef versus treble clef in music. The more relevant approach would be to find out what scale the charts are using, or simply ignore PPM and use EC.the shitty thing with the cheap meters it they don't tell you the scale they operate on. it's safest to assume they're on the 500 (Hanna) scale, but if they're operating on the Truncheon or whatever tf the other one is, then your readings will forever be off. IMO go off what the plants are telling you once you figure out what each part of your nutrient regimen does to the solution. The girls won't hesitate to tell you when they're pissed off or happy. Increase feed until you see slight tip burn then back off a hair and keep on keepin on.
Correct. Use ec for a general guide. Some plants grow perfect at 1.2 others might need 2.0. You just have to find the sweet spot.So you're basically saying to ignore readings, let something go wrong, then diagnose my plants and take corrective action? My readings aren't off, they are just on a different scale, like bass clef versus treble clef in music. The more relevant approach would be to find out what scale the charts are using, or simply ignore PPM and use EC.
Not sure what scale you are using, but i would add calmag till your water is 0.4e.c or that's 200ppm on a 500scale, and that's 280ppm on a 700scaleJust a month into my first crop with coco and fertigation, and I'm trying to understand the water chemistry better.
One specific question I have is in regards to a feeding chart (Fox Farms hydro chart in this case) that lists desired PPM and EC limits. Doesn't matter what they are in this question.
My chart says PPM in week three should be up to about 1050-1190 ppm, and an EC between 1.5 and 1.7. I'm assuming these are maximum limits.
My question is "Do I adjust to the limit of EC, or PPM, or whichever is higher?" My EC is much higher than PPM. That is, when I finish mixing my nutes I have an EC under 900, but EC at 1.9.
I'm assuming I ignore the PPM reading, and add RO water until I get the EC down to the upper target limit of 1.7.
Here's what I'm doing.
OK, so I start with 10 gallons of RO water, PPM 20 or less. I add my Silica and wait an hour, then cal/mag. I add 2.5ml/gallon, as directed. I note that PPM jumps to 300 at this point.
Next I add my nutes, which for now are Big Bloom and Grow Big Hydro. After the Grow Big, my PPM hits 800 or so and my EC skyrockets to around 1.9 And my pH drops like a stone to about 4.6. I don't think the remaining chemicals change the PPM or EC much.
Next, a dose of Humic Acid (Diamond Nectar), and a sprinkle of Yucca Powder.
At this point my pH is very low and I add some pH UP to bring it up to 6.0 or 6.1. (Once I dump it in the reservoir a Bluelab controller keeps the pH down to 6.0.)
It is at this point that I adjust the EC by adding a gallon or so of RO water. EC drops from 1.9 to 1.7, and PPM goes down to 860 or so. That gives me another 200-300 ppm to play with, but no EC room.
Just go on that your feee chart is 500ppm scale because if it is not then you just giving slight less food then what the that says because 500scale is less than the 700scale so that be safe,The point here is that the CHARTS stating PPM need to state which measurement system is being used. EC is EC, but PPM isn't always PPM. My Foxfarm chart doesn't say which PPM it is, but I see my new GH chart does. I don't know what my meter is set to, but I can guess it's using the 700 scale. It wasn't until this post I even knew there were two scales in use. It seems I have a PPM (700 scale) and a PPM (500 scale) chart.
The more I think about it, the more I wonder why my meter is set to 700 to start with, and if it can be reset to 500.
Feed chart*You need to know what scale your meter uses. View attachment 1227853I have 2 PH and TDS testing devices. The problem is when you look at different manufacturers new trend chart recommendations they sometimes don’t tell you what TDS scale they’re using to measure. One scale is half the other scale. What type of runoff meter do you use?View attachment 1227853View attachment 1227854
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