So make liquid dilution + H2O if you honestly feel you need more precision........
I can easily prove you don't...........
Especially with GH............
That's the deal with the precision you have with test kits, they introduce their own set of measurement error. Often quite large unless well calibrated and accurate over a very precise range. Common GH test kits measure to +,- 17-20ppm. Even the best Lamott or Hach can barely hit 4+,-ppm.
I think I can easily hit 1-2ppm + or -.
I can hit that and even closer with a standard liquid dilution.
EI does not mean you have to do dry dosing, the traces seldom suggest that, if ever............
But it's not going to make any difference either way where it really counts, the plant's health.
a GH of 4-8 will make no difference with any plant I know of, that'sa effective target of ~80ppm.
If you cannot estimate that, even with lots of error, you got bigger issue.
PO4 and Traces need more accuracy than other nutrients as rule.
Any others can be 1-2ppm accuracy and easily targeted with a simple 1/4 teaspoon.
You can simply divide the 1/4 into 4 equal parts, this is fairly accurate.
You can check the APD post for 1/4 teaspoon accuracy. I ran 20 replicates, they were very close, to within 7 mg each of 1.67 grams for KNO3.
Certainly nothing that would ever make or break and dosing routine.
We are human and the method EI assumes that.
You add a tad more some days and tad less others, main thing is that the plants are well fed.
No one is all anal about maintaining +, -, 2ppm of Ca++ in a FW plant tank.
You can try to keep it there, but this uneeded stability will falter after a while.
You can run a time limited test, but it's a terrible way to force yourself to keep up on a method.
It gains you lots of work, not better growth.
Careful what you assume to be true. See if you can disprove that.
We used to assume that PO4 excess(or any nutrient in excess) caused algae.
You can disprove this easily.
Likewise, the same was said about high GH, KH, NO3, Fe, ad nauseum.........
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