I guess different growers use different techniques. The amount of flushing I do is dependent on the plant. I flush smaller plants for 2-3 days, medium plants for 3-5 days, and bigger plants for 6-7 days. I may be wrong but the product comes out great; no harshness. I am sure that flushing puts great stress on plants. We are all aware of that. The point of flushing at the end if a plants life is to decrease the amount nutrients in the plant right before harvest. Stress on a female plant before harvest makes the plant focus more on buds. So I don't see a point in not flushing; soil or hydro. Again, I may be wrong, or inaccurate.