I have just started a DWC setup and I am useing river rock but it was from my fish tank and is like small pea gravel,I boiled it for 15 minutes before I used it and it seems to be working,but I would recomend mixing in some pearlite or vermiculite because I still have to top water daily to keep the rockwool from drying out and hope that I wont have to do that for to long,I am just starting to get roots out of the bottom of the pots,this is my first attemt at hydro and am learning as I go.If you are useing rockwool you may want to soak it in ph adjusted water over night,and double check it before you use it.that was my first lesson learned good luck
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