Sorry I don't know what you mean by unmet requirements. I didn't see any mention in previous posts.
The 1.389 gram dose is a full weekly dose for EI. The daily dose is 592mg. Select EI Daily in the picklist for that. However, based on your initial post you don't need KNO3. You said your nitrates were high.
Based on the title of this thread I read your other thread about nutrients. Creating equivalent Seachem concentrations is not a bad option for you. Obviously you will need the dry fertilizers and some sort of containers. Nilocg sells them at a competitive price. In fact, I don't think you will find them cheaper anywhere when you include shipping fees. Nilocg includes shipping.
The minimum fertilizers you will need to continue the method you have been using are DTPA Iron, K2SO4 and Plantex CSM +B. Personally, I would add KNO3 and KH2PO4 to that list just so you will have them if needed. The cost is minimal.
Below are the recipes to mimic the Seachem's products you use. The form of nutrients are different but the same level of nutrients are supplied. Use these solutions exactly as you have been.
add 13 teaspoons of 10% DTPA chelated iron to 500ml of water.
add 9 teaspoons of K2SO4 to 500ml of water.
add 6 teaspoons of Plantex CSM +B to 500ml of water.
Those recipes were calculated from this calculator
. It does calculate for iron as well as many others. Change the "I am dosing with" selection for whatever nutrient you are calculating for.