Yes, the same stuff, more or less, as sold for
aquariums. This version probably isn't as lush.
It survives our winters, coldest is usually about
5 degrees F, but has gotten colder.
As long as it isn't listed as a noxious plant for
the UK. Nobody has started policing ponds here
yet... though we have wondered about pond police
and illegal water hyacinth down south.
k :-)