I have been using the recipie for success kit 4 a while now in soil and DWC and all i have to say is the kit is worth every penny of that 30 bucks. i mix it weaker than the chart calls for because there recipie is a little high. dont quote me but i think technaflora puts ph buffers in their stuff to keep the ph from drifting. good stuff highly recomend for beginner of advanced grower