Hi
@SCgrow! From the solution/feeding. But be warned that all diaries do not have accurate informations. In soil, your pH must remain around 6.2 during the whole lifecycle of your plant. The EC should be very low for seedlings, then it slowly increases as we add more nutrients to the solution. The easiest way is to find out the best doses for your solution by yourself, start with the fertilizer brand's feeding schedule but divide their numbers by 2. They usually recommend unrealistic schedules with very high ECs. After a few weeks of 1/2 of what's recommended, slowly increase nutrients/EC unless your plants are showing signs of toxicity/nutrients burn. Don't measure the runoff values, unless you're having a serious issue with your rootzone, you will complicate your analysis (numbers in the runoff can get crazy) and will degrade/uncalibrate your testers faster. Hope this will help, keep us up-to-date and happy growing π