Unless you plan on testing each time you do a water change, the levels will and do change as far as the tap water's source.
The entire notion of the EI method is to get away from testing, and focus on growing the plants and doing aquascaping.
Few of us got into this hobby to test.
I have not met anyone yet that claims to have.
EI assume max light/uptake rates for the dosing, this way you will never run out of a nutrient.
The large frequent 50% water changes prevent anything from building up over 2x the weekly dosing.
So you can easily maintain a range of nutrient levels
which is more more realistic in practice and practical and much larger target to hit than 1ppm variation of NO3.
No hobby test kits have that resolution anyway.
Is there a differenc ein plant growth of 10ppm NO3 vs 20ppm or vs 15ppm?
I think you'd have a tough time showing this and then implementing it without a dosing pump that is highly accurate(around 100$+ each).
I have them, but I do not find any significant difference nor gain, they are nice if I leave for a week or two though.
3rd annual Plant Fest July 8-14th 2005!
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