Well I use it in a 2'x100'x4" deep trough to grow lettuce.

you have to get sawdust that is more chips, then dust. 3mm-7mm, Or it stays too wet.

It can be mixed between 40-60 % with rice husks, or peat...just a variety of the list above. I will get you a little more info or just go to hygronomics.com and look in the gallery, at the different commercial setups of our members and friends. Peace