I read about it in Robert Connell Clarke's book, but didnt remember the exact term I was trying to think of till I had typed all that lol. But as soon as I read about it flushing kinda started to make more sense, that is why I try to do it subtly because you can shock the plant like dude you quoted was talking about. Hence why when you do a hard flush you are supposed to pour a low dosage of nutes back in at the end of the flush or you just end up starving the plant, and as you stated before in organics flushing is just about impossible if you are doing real organics.