Sounds expensive. One question I have, why does the new aquarium in Atlanta, (Staffed by lots of marine biologists), which is close to the Ocean still use Instant Ocean to fill their tanks? I would find out, there may be a reason they don't use NSW. Also it is important where the water was collected. I lived in Alaska for awhile. The water there is very high in Nitrates. This caused very large plankton blooms which is why the commercial fish like salmon and halibut are so numerous and big. I doubt that the water they sell comes from equatorial reefs. But I don't know. Just questions I would ask before I bought the stuff.