Seedleranswered grow question 2y ago Do you mean the run-off or the watering water?
Unfortunately, I don't quite understand the question. If you have dry amendments (meaning you've mixed dry fertilizer into the soil), you just need to pay attention to how much you water and that your pH value is "in order." So not 4 and not 9 either. The rest is taken care of by the soil, the microbes in it, and the plant. EC value with organic fertilizer is a whole different story because organic fertilizer only provides "food" for the microbes, and they make it available for the plant.
"Additionally, no further nutrient solution should be added to the watering water." How do you plan to adjust the EC value of the water at all?
If it's about your general tap water and whether that's okay, then the answer is probably yes. The EC value of my tap water is about 0.48. If yours is "approximately" in that range, then it's fine.
If I couldn't answer any of your questions with my numerous answers, please tell me exactly what you want and what you mean; there are no stupid questions here :p