Just a heads up! PH Perfect won't keep your PH steady at any level. What it does is allow your plants to uptake nutrients in a large range, like 5.6 to 7.0 without adjusting your PH.my ph is around 6.0. i think sensi a and b ph perfect keep it around 6.0 that is what hydro store guy says. in veg they root stay bright white until around 2nd week of flowering. i use the same veg for the first 2 week of flower, exacting the same. I veg for 1 month and no problem at all. i dont know wuts going on...i use monster grow also and it got really high N. my ppm around 600-800 on veg and first 2 week of flower.