From what I can gather it is best to start flushing right about where you are, feed only water with a good 10-15% run off every 3-4 days. This is the method I have used for my plants, admittedly I've only done 2 though so I'm no expert at all.

One of my friends told me that she flushes in only 2-3 days and has even done it in 24 hrs before, standing the plant in the bath, filling the pot completely with water and letting it drain through before refilling again. Not sure how this can work though as the point of flushing is to get the chems out of the plant and not the soil, can't see how this gives the plant long enough to absorb the pure water and dilute the chems.
:hippy: