There are many lakes here in trouble, sadly. Off the top of my...

There are many lakes here in trouble, sadly. Off the top of my head I can think of Lakes Rotoiti and Horowhenua in the North Island (last I heard, both are considered biologically dead), and Lakes Forsyth and Ellesmere in the South. There are many others. I'm not talking of the hydro lakes (those are a relatively small number of large lakes). Ellesmere I think is the largest example of a NZ lake that is pretty well stuffed. The eutrophication is being caused mainly by nutrient runoff from farms (NZ has seen a huge increase in industrial-style dairying in particular in the last couple of decades, with a consequent deterioration in river and lake water quality).

Agree that the total NZ market is probably reasonably small on a global scale, but from a PR point of view, given NZ's dependence on tourism and that "clean green" myth, cleaning up a few of these dead lakes with Phoslock could be quite a shrewd move. If only our regional councils would pull their heads out and read up on it.