Stickanswered grow question 6 years ago Hi there! If your runoff EC is higher than the initial EC from your waterings, then you have a salts buildup somewhere in your soil. You don't have to flood it all to get a proper test, you can water verrrry slowly on a single location (on the outer border of the container) you'll see the water pour out at the same location you did water without flooding the whole container. There's no need to over-water it to test the EC, but you'll probably need to flush the medium for a couple of days, to get rid of its toxicity. I hope you'll figure this out, keep us up-to-date and happy growing 👊