I've read lots of convincing information that flushing is not really needed in hydro the same way it is in soil or less so in coco, yes coco is hydro.
If you consider how long it takes to see toxicity or deficiency when growing in soil compared to hydro it seems clear that a shorter 2 to 3 day flush at most is all that is needed.
I tried a 2 week flush and then a 2 day flush and besides the effect it has on foliage I couldn't, either could anyone else, notice a difference.
I am lacking on years of experience with only a couple under my belt but traditional flushing in mediumless systems seems like a total waste of time and perhaps ripening potential.