I have done my hempys exclusivly this way.when i first made them i only had a little perlite and some old 4x4 rockwool cubes.but i was running 5 gal dwc and wanted to try something differnt.i read about a guy doing 112 plant sog with only 2liter soda bottles.so i got them ready but had no vermiculite and didnt want only perlite because i wanted to be holding some water above the rez.i used 2 liter coke bottles and tore the rockwool into small pieces and mixed with perlite and these things took off! i still have 2 in flower about week 6 ill post pic tomorrow.the original thread i read he was pulling around 18 g dry off each 2 liter but im getting well over a oz each.however i didnt defoliate.but to answer its great combo.after thst i skip vermic n bought a rw slab to breakdown( 5.75 compared to 22.00 for already cubed rw bag) im actually starting a new grow with this mix this week with 2 gallon buckets this time.if i pulled over a zip with barely more than a liter bottle (2 liter cut down) how much can i pull off about 6x larger container (almost 8 liters.just so much less hassle than dwc.and shows potential.