Kindbudzanswered grow question 7 years ago Yes you will switch out your nutrient treated water for plain Jane regular Ph’d water. For deep water culture you won’t need any flushing agents due to there being so soil, coco, or other water retaining medium that holds and builds up salts. If you truly wanted to use a fushing agent however my personal favorite is Sledgehammer by fox farm. I did notice some curling up of the leaves as well. This could be caused by a few factors such as: improper ph, wind burn or heat stress. Double check on all three factors and make sure that they are all in line. Best of luck on your grow and I hope you yield well!