If using a flood and drain system that recirculates the nutes, using clay pebbles and the buckets are 10L outer bucket and 6L inner pot, how would you figure out the timings for flood and drain? Do they vary during the life of the plant or between veg and flower? Does it depend on strain? How do people figure out how to set the timings? What is the theory? Submerge the roots long enough to uptake some nutes and then keep the roots in air as long as possible before drying out?