i would like to know how to get ph out of rockwell. and also i took reaguler driveway rock wash clean so this crop i have rockwell in one hydro system and drivway rock in another hydrosys with drivway rock since i always mix nuts to right ph before adding to system i have not had to adjust ph in rock sys. and as always in the rockwell ive got to lower ph a little everyday its only been 1 wk the sarts from gravel and rockwell look about the same mabe advantage gravel by the way all starts are my own strain i crossed bluebeery and northern lights got some awsome seeds so every start germenated seeds if your enterrested in out come ill update start of bud cycle. also i dont have a clue how rock is going to do as meadum but i hope it works beacuse ill never have to adjust ph