legalcanada
Well-Known Member
ppm is a poor measurement because the only way to calculate ppm of an unknown solution is thru chemical analysis. all ppm meters measure EC then convert using one of many scales. EC is a better measurement because 1 EC will always be 1 EC no matter what. depending if your ppm meter is x500, x640/650, x700 or many more you will have different results.Someone made an interesting point yesterday.
The feed chart recommendations are made for 1000w lights, and if you’re using 600w or 400w that you should dial back accordingly.
If I mixed up H&G at their recommendation, I’d be over 2000ppm.
i.e. 2EC could either be 1000ppm, 1300ppm, or 1400ppm depending on your ppm meter and which conversion factor it uses. also different nutrient companies use different conversion factors depending if they are european, american, australian etc.
it depends on which salt your nutrients use: The ppm 700 scale is based on measuring the KCl or potassium chloride content of a solution. The ppm 500 is based on measuring the NaCl or sodium chloride content
here is a list showing which companies use which conversion
Attachments
-
24.1 KB Views: 6
Last edited: