Get the runoff ec lower. Feeding at 770 ppm or 1.15 EC, and the runoff is 480 ppm.... Any idea what's causing this? stckyprp Member. Place each sample in a clean jar and use a calibrated EC meter to measure each of the samples. I feed at a ph of 5.8 but the runoff is 1 point higher coming in at 6.8. You are looking for a stable EC, and a stable PH, with around 10% runoff. It goes in 5.8 and comes out 5.2. Not just an anomaly, this has been every feed for 3 days and is predictable. Im running gh 3 part in coco and im having a prob with my ph. Or 6.3 in and 5.6 or lower coming out. These readings should be taken at the same hour every day. No PPM change between runoff and sump (or lower than normal drop). Im getting a little claw and slight tip burn on new growth. Growers Network does not endorse nor evaluate the claims of our contributors, nor do they influence our editorial process. Post by Josh » Wed Mar 11, 2020 4:26 am. I have increased my runoff. Low runoff ppm in coco. Aug 21, 2020 #6 Thanks I lowered it down to 900 hopefully that helps. Re: Coco,Ph and flushing technique. I noticed less runoff and a longer delay before runoff happened after my pump stopped. Plants potted in a coco substrate that are fed a high EC nutrient solution may experience salt stress if the media is not rinsed throughout the growing cycle or allowed to drain more freely. Finding the Best EC for Cannabis Plants in Coco. Coco grow, runoff EC levels LOWER than input levels. I am using straight Coco. Does that mean the plant is eating the nutrients your giving it? Testing EC and pH simultaneously is a good way to optimize operations. Question. My runoff ec is climbing to 1300 now (1200 going in). Thankyou for your reply. ( i watered yesterday) I have read on another site (grow weed easy.com) that , the method i used was the correct way to treat a pot of Coco showing such a low Ph ! This implies that your plants are not properly taking up the nutrients in the sump. So I feed via a drip system, coco, drain to waste, and have been measuring the ph runoff as well as EC. GWSD82 started grow question 4 months ago. By monitoring the EC and pH of the feed before you give it to the plants, and then monitoring the EC and pH of the runoff, you can figure out if your plant is being overfed, or under fed. A good EC (or ppm) measurement is made by collecting water samples from the reservoir, growing medium and runoff. Hungry plants or something more sinister? If a high EC feed is used, runoff should be at 20%. Hello DGC, ive been growing in coco coir for well over two years now. G,day gr865. Dr. NPK of Elite Garden Wholesale takes us through why you should test your runoff nutrient solution, and what some of your results might mean.. I am running drain to waste. If I feed, say 500 ppms, and I test the runoff and its 500 ppms. For now I just bumped up the event time by a minute, but ec hasn't dropped yet after almost a day and four feedings (plus one healthy hand feeding). Keep in mind: if your PPM’s are super low in the runoff, consider upping your nutrient treat rates slowly. Consistently low run-off EC in Coco. I have a question about runoff ec readings. The following is an article produced by a contributing author. I'm pretty good at reading plants by now so not looking to change anything, just curious what y'all think My inflow EC is at 1.1/1.2 and run off is between 650-850 consistently on 2 out of 3 of my plants. EC of feed is 1.4 and EC of runoff is 1.5. Since getting a better light, runoff EC has been dropping steadily, and is now LOWER than input (~ -75 micros below). If a low EC feed is used, runoff can be minimal. 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