Ok well first of all my friend you should always flush your medium I have and so have so many people smoked unflushed buds they taste horrible ..when you put all that effort into making a beautiful girl and look after her , don't skip out on that vital phase ..I would or I have flushed for 7-9 days the first day I put in florakleen to get rid of salt buildups in the soil and then I flushed with plain PhD water .the rest of the time the last few days I put ice and cold water into the pot and on the last very last two days put her into the darkness for about 32hours ...she smelt good and the ash burned white that flush is killer important from what I have seen best of luck with the harvest buddy..