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What are the major challenges you have yet to face to make it economically viable?

e.g manufacturing your nano material at scale or obtaining higher efficiency..

There are no limiting factors to us scaling now.

So is it fair to say that basically your only constraint is the price of your input electricity?

That is the main input. We also have to keep the capital costs low, but that looks good too.

I am curious about the membranes - is the production capacity available to produce them in such massive quantities you'll need?