They aren't available stateside yet. It was his job at macna to drum up enough interest to convince wholesalers to pick it up. The problem is it would likely have to retail around $25 or so.

What it is is a collapsible 2.5gal or 10liter container. It has a screw top with a built in ball valve to release the water. They originally come with enough of their pro reef salt for 10liters and you add the ro/did water. As you do that it expands and then you shake it and have fully missed salt in a few minutes total of work. Then you can buy 2 pre measured salt packets to fill it back up and reuse it.