I use rockwool cubes sat on a N.F.T. table with a spreader mat feed by A+B Canna nutes. My Mrs uses 'TNC Mycorr max' Mycorrhizal inoculant in the garden on her veg and it seems to work well when grown side by side with plants that haven't had it. I was looking at the Great White as it says you can use it on Hydro.