I always talk to the same person, every time, cause I want to, at advanced nutrients, when I call, I ask for him.
He told me all that ph perfect products were designed to be used in DWC, but other growers told him that it works ok, growing other ways too. But he also told me that they get complaints big time ,Every day from people using the ph, perfect products. He said they are still to this very day ,trying to figure it out. It does not work great for everyone, even with RO, water, or less than 100ppm water,. I use advanced nutrients myself, without RO, water an it does ok, but the bottom line is they want to sell nutrients, he also told me that they were worried about some real easy to use products out now like MegaCrop, an several more new products that are 1part nutrients, an super easy to use, that they were also trying to get in on that ,part of it.
They have guaranteed on my bottles, in big letters, in little letters ,they say for Optimal results, or water less than 100ppm, they want to sell, any way they can, the more the better. They got the best adds, an advertisement, but Advanced Nutrients are not the best out there, by any means. They are ok, but not any better, than the others, even with all their little commercials like the one you show where they do it on camera, I don't think they tell the truth, an neither do lots of other people, all you got to do is read reviews, that have not been doctored. An read other forums, some like advanced, but a hellava lot do not like Advanced