I use rockwool cubes that are cut up on the bottom half my basket and then put hydroton on top of it. I guess it would be more like a 25% rock wool to about 75% hydroton. I like this because when my plants were young they had that rockwool to grow too. I know my way works, I have root balls like basketballs lol. Thats what i did this time so ill have to wait and see how it turns out when they get a little heavier with buds.