I continue to not flush with water. In fact using doc buds kit there is no flushing at all. Check out doc buds kit instructions in my sig. it will take you to one of docs threads. Then find one of docs posts with links in his signature. You can post in any of his threads if you decide to get a kit. Each kit will take you from seedling to harvest for 5-6 plants. The soil takes a month to "cook" but it is a super easy and workable method that makes the best most flavorful buds I have grown in 2+ decades. I am a solid believer. New growers regularly pull out fire with Docs kit. Watering nutrient takes about 1 minute to mix and there is no pH meter. You rarely see deficiencies and doc is always there on his thread to answer any questions. He follows up promptly when any problems arrive with SOLID advice. Just look at his plants, or heck look at the top grow in my sig. It's my 3rd run with the kit.