From what I understand, amazonia II is softer than its original counterpart, as it breaks down easier...This isn't to say that you put it in a tank and it becomes a muddy mess - this isn't accurate. The only areas in which my AS are affected are those in which I did a lot of "hard" work on the hardscape - when I positioned the driftwood and buried it into the substrate, I must have been a bit rough because in these areas (there are 2, about 1x2" and 1x1") the AS has turned into dust essentially, though it is below the top level of the substrate (you can see the dust layered near the side glass, though). I make it a point to vacuum this area whenever I do a WC and it seems to help. I have a very slight cloudiness to my water, but it happened after I stopped using purigen (I left it out in a rainstorm and it won't regenerate).
After seeing this slight deterioration of the AS in these areas in my tank, it makes me wonder if some of the talk about AS degeneration is not more accurate than I originally gave it credit. However, since I haven't noticed this anywhere else int he tank(except where I did hte rought hardscaping), I
m going to give ADA the benefit of the doubt and blame it on user error - I should have been more careful not to break-up the aquasoil when doing my hardscape. I think the reason amazonia II gets blamed for this more often is because, as I mentioned, it's softer so it is more easily broken.
Just my best guess based on my experiences so far.
Sorry for your troubles - hopefully the new batch will set things right.