They told me. See the myriad threads in Randy's forum. It is formulated to mix balanced at 1.021 or 1.022 (I forget which). It gets exponentially more unbalanced with each point. If you mix at 1.025 or 1.026, you end up with Calcium over 500 and alk crashes, other ions also unbalanced.
I forget the guy's name at Oceanic. I spoke to them on the phone and again at IMAC 2005. They confirm not to mix above 1.021 or 1.022. So, it is not good for those who wish to keep their tanks above that, as most of us do.