Also...since it seems I am in a product plugging mood, I also recently started using Flying Skulls Z7 due to a free sample that came with a cloning bucket I recently picked up. I use tap water and don't have any plans to go RO. I know it is better so spare me the lectures, but I just am not going there. So far, in my search to make tap water work as best as possible, this stuff has proven itself in a very short amount of time. I already use enzymes and beneficial and rooting hormone products that have made for some really healthy roots, so not sure if I will see a huge increase in root growth or condition as they claim, but the pH issues you can sometimes experience with tap water seem to be nonexistent in the buckets I have run this in. And you use like 0.5ml per gallon so it lasts for not too much $. There is so much stuff out there that I am sure you can find other options - but if you are looking for something like this, I have found it to work pretty well over the last couple of weeks.