I have stuck to simply adding the final flush to my regular water schedule for 2 weeks and I'm also in soil and not hydro. I do NOT flush by watering with 3X the pot size. Why over-water??? The final flush is no different than any other nute lockup supplement. It simply breaks the nutes up that are overly built up. The only reason I use it is because my soil has a nute release program and I want to make sure my final product is clean.