I think of it as the plant is at the end of its life, its already frosty, it already reeks, it's about to be chopped so feed just water until the final moment when I can chop and harvest it. I think "FLUSHING" has many different levels, methods and extremes.
Some people think a flush is just giving plain water for the last week or two until runoff, some people think its putting 10 times the container volume of water daily to where your draining out tons of the runoff..
This thread will never be constructive and the last 4 pages proves it, there are a couple people willing to discuss it and everyone else is either following the leader or going off their personal opinion or preference.