Run off ph issues coco

"clearing' the medium is not somethign that requires major flushes. Simply change your formula and give some excess runoff for an irrigation or two and you'll be fine. If irrigating properly from the start, "build up" is not possible. It's possible to provide too much in the formula, but 10% runoff, if religious about it, will prevent 'buildup of salts." Can't happen. If you stick to 10% runoff an equilbrium will result over time. it will remain constant. Adjustments to the formula are the path to fixing symptoms in the leaves. This is one of the primary benefits of soilless growing. Easy-peasy diagnosis of problems and simple fixes. pH should not swing alot. That is indicative of a poorly ph-buffered fertilizer or not adhereing to the 10% runoff and your ratio of nutes get out of whack due to the selective nature of how nutrients traverse the root membranes. Make sure to ph-balance any water you put into the pot. that will help. Ensure oyu get 10% runoff, which i have doubts was occurring before this point. coco is soilless so you need to provide 100% of the nutrition all the time. Your fertilizer should be 100% soluble and 100% plant-avaible upon dilution. You may need a different formula for flower phase vs vege phase, but relative to any stage of life you'll feed the same thing evertime you irrigate, once you have things dialed in. full bore vege formula suggestion: N 120-130 P 40-60 K 180+ Ca 100+ Mg 80 - around there S - 100 - around there. This would be a safe 1.2-1.3EC starting point that you can easily adjust based on what you see in the plant. No matter what suggestion you follow, some trial and error will be necessary to get things running smoothing seed-to-harvest. If you are systematic about it, you'll have a very good idea of how to do things withing 1 grow. My process is a bit in flux at the moment, but you can see my formula at various points G-week, week 7 and then at some point in flower i have a screenshot image of my formula breakdown. Fertilization is a culmination of every decisions you made up to and including the preset... so, how you feed early impacts how much you need to feed later. Because the balance was off early on in this grow, you'll likely have to do things differently 'next' grow, if you do a better job from the start, but it will still be similar... and once things correct themselves this grow, you may need to adjust formula again once it's back on track.. rates of change... competing rates of change... it's not static. it's dynamic, but you can find the balance... the equilibrium that results in consistent, healthy growth. Feeding a plant is about proper concentrations and ratios around the roots that don't interfere with each other and allow the plant access to enough of it... this has little to do with the ratios of use inside the plant. This may help with a proper perception of the goal of fertilizing... 'easy access' not 'ratio use.' Better hydro products will not be so susceptible to pH swings, for what it is worth. Fix any habits above before assuming that is the case with your choosen products. If it continues to happen even with good fertigation habits and proper diet, then you can blame the product.