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I am curious about the results I get doing a pour-through test of pH and EC. I read a publication by Purdue University agricultural extension that described the process of soaking the media in water, letting it stand an hour, then pouring more water through and catching what drains out of the...

These are about 3 weeks into flowering under a LED light (that may have been a bit too close). GH Flora series nutrients. Plant is a White Widow. They started yellowing around the time of flowering. Water is city tap water that runs 480 ppm and 8.1 pH out of the tap. I'm using GH Flora series...