I just have to ask. Has anyone of you that are saying not to adjust ph, ever tried it? I have. My water has a ph of around 5.9-6.5, and when i mix bio grow, fish mix and bloom, my ph has dropped far below what is recommended. It get close to 4.0 when in late flowering. After mixing in biobizz nutrients in every 10 liters of water, I have to use 5ml of ph up (not using organic) to get it around 6.5. And i have had no problems with my plants at all. No lockout, no deficiency. And yes, i do use all the biobizz nutrients. I use bio grow, fish mix, bloom, top max, bio heaven, acti vera, alg-a-mic and cal-mag. I do use both bio grow and fish mix togheter, half of each. I also use some bud blaster that is not organic at the last two weeks before i start flushing. I am not saying you are not correct in that the ph will adjust itself. But the plants will for sure feel it when you feed them water with a ph in the 4 range, and get unnecessary stress of it. So to me its logic that you adjust the ph so that the plants dont get that unnecessary stress. It will take a little while before the soil adjust the ph, right? And if the guy from biobizz that has answered the mail shared in this thread, is correct. That the ph will not adjust itself up. Then i dont think my plants would be doing any good. But i have not tried without adjusting the ph when using biobizz. So i will take one plant next time and not adjust the ph on it, to see if it will be just as healthy. I would like nothing more then to not adjust ph, thats money saved.