Jorge Cervantes wrote an article for High Times, about 10 yrs ago, on a type of drain to waste in 2 gal nursery pots that watered from the bottom up, after the clones were well rooted. After they were rooted, the tray they were in was flooded an 1"-1-1/2" deep. When the tray dried up, they watered again. Clear watered every third time.. The mix was perlite/coco, not packed to tight, a few bumps on the bottom to settle it.. I did it a couple years...To many plants, too much work, but it did work... Not the 1g per watt Jorge got in the High Times article. I don't have any pics, but there were some fine ones in High Times...