okay. i'm on my first grow and have a question (faq still down). i'm a little over 4 weeks into flowering and planning ahead. how should i flush my hydro system before harvest? i've been told to go to just straight r/o water about 1.5 to 2 weeks before harvest. should i slowly change over to water when refilling system or should i just drain all of the nutes at once and go straight to pure r/o (pH balanced of course)? i've been using gh flora nova nutes the entire time. any advise would be greatly appreciated!