«We would like to remove all the iron, but for many applications, residue within
these tubes is less of an issue than if it were on the surface,» Barron said.
On the upside, areas inundated by fellow tourists will
be less crowded, so jostling for that perfect camera shot, or a resting spot atop an amazing vista for a view
of the valley below won't
be an
issue - and it won't feel like a competition for a seat on the London
Tube or New York subway.