This is one of the biggest misconceptions about growing with chemical fertilizers.
Now i know you will claim bullshit on this, cause of pride, but plants and people are very similar.
So when a human ingest too much chemical food, gets vaccines, or takes too many non organic supplements, it gets stored. This material does not readily come out of tissue. It actually has to be physically detoxed from your body. Not just drink plenty of water, cause this will not bring the toxic material back out of tissue.
Plant are very similar, and when you start your regiment and max out what the plant can take, say 1200 ppm or whatever you use, the excess will go directly into the plant tissuse and is stored. By the time you see those little leaf tip yellow, its too late. The plant is already storing the excess toxic compounds in their tissue. So you can flush all you want, it wont clean this material out of your plants!!! This is why that even well grown chemicals will be harsh after prolonged use, and the flavors fade and the high is weaker!
I have grown with chemicals for many years before i switched about ten years ago.....and still am trying to perfect the finish, to where its super healthy, but fades just right, so no fertilizer residue. It is not an easy process.
So you can call me inexperienced all you want, or think i dont know shit, cause i couls give a rats ass what you think, and thats why you will never experience what a great Northern Lights has to offer.
So grow your chem weed and think your an expert, cause you can follow instructions well, but dont act like you guys know all, cause you dont!!