Good news it is now available here. It was available to overseas
relief groups for several years and is an excellent product.
Costs about 1 cent per gallon of water for them to treat.

I don't know why they waited so long to make it available in the
US.

One of the issues they had with it during relief work was
that some was just handed out without a lot of information on
its use, and some folks were eating it in the belief it was
also medicine that could be taken for cases of water born
illness!