I've used FloraKleen a couple times and to me and my n00b experience, I can't tell the difference between being flushed with FloraKleen and just regular RO water. I read somewhere on here a while ago that these "final flush" type products are mainly just sugar water. The way I see it is, as long as you are starving the roots of any nutrients, they will have to consume what they have stored up in the leaves and such which is the point of flushing anyways as far as I understand it. Hopefully someone with more experience can lend more insight.