Flushing

Now, these buds are right about ready to harvest. 10-14 days with only plain water should do just fine. There is no need to wash your pots with gallons of water, this will not "clean" your buds any faster than just giving plain water in normal amounts and at normal intervals. "Flushing" is a process to get your plant to use up/expel any nutrient salts in its system, not an exercise in drowning the bejeezus out of your plants. "Flushing" should more correctly be called "nutrient witholding period". As a rough guide, I like to stop feeding when there are about 95-97% brown pistils and harvest when there are about 98-99.8% brown pistils, which is usually about 2 weeks later. This will put you in the "10-30% amber trichome" zone without having to look too hard at your buds. Once there are 100% brown pistils, the plant is getting close to death and THC starts to rapidly break down into CBD and CBN, two non-psychoactive compounds that don't get you high, but they do make you sleepy. Hope this helps, Organoman.