This was my first grow where I used the Grotek Final Flush. For hydro, I used according to directions and basically soaked the roots in the dilute solution for about an hour and then returned the plant to pH adjusted water in reservoir. I believe this worked well - there was a noticeable change in terpene profile (i.e. smell) and this product definitely helped finish off the plant. Prior to flush, I observed a nice fade starting on the main colas that was accelerated after flush leading to a nice finish.