There was a reefer on the east coast here in Florida using NSW a few years back. He swore by it. He is out of the hobby, now. I know that once in a while, we get "red tide" in Florida. Not sure about your location. If I were to go for NSW I would make sure I got it from an inlet area at high tide. There was a video on here, or maybe the "other reef website," a while back showing a guy in South Florida getting NSW. The water was moving like there was no tomorrow in or near an inlet, which would be better than getting stagnant water from a tide pool.