Re: TMG recommended dosage with EI?
I'll say this, it does not matter, the actually delivered ppm vs what the the dosage needed to supply the plants with enough are two different things.
What is in the water column in terms of ppm Fe varies rapidly.
It is a poor way to predict plant growth.
Test kits have many issues.
Basically you do not need to worry about it.
EI was done with TMG and Flourish FYI.