They have a new Aquasoil now as well, called Aquasoil Amazonia II. It supposedly doesn't release as much NH3 in the beginning. They nutrient mixture ratio is supposedly different than AS I. I tried to order it, but they were out, so I settled for the regular kind.
Quote:
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So this time Aqua Design Amano introduced "Aqua Soil-Amazonia II", a new Amazonia type substrate, produced with different black soil mixture ratio, preventing water coloring or cloudiness. As the base color or plant growing pattern is different from existing lines, we continuously market Aqua Soil Amazonia. Please select according to your needs and preference. But if your base water* is alkaline, we recommend to use Amazonia II.
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From
http://www.adgshop.com.
I wish I could find this locally. I would have it in more tanks.

The shipping costs for multiple larger bags is too much though, since the places I've ordered from are in California (and I'm in AL). I love the grain size. I have not used the regular size AS before, only tried the powder form (very messy). I may have found a new favorite substrate.