Water Changes using NSW from White Rock

[Aquattro]

I think the local plankton would be temperature acclimated and die off at our tropical temps. As I said, a friend of mine used it for a long time on his large tank, taking water from about 100ft offshore, and now that he's moved to artificial salt, his tank is doing much better growth and color wise.
Coupled with the risk of some unknown contaminant, I wouldn't risk it on my display tank.