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Red sea salt is not a natural dried ocean water. For matter of fact, if you dry ocean water, you wont be able to reconstitute it by adding water. The calcium, magnesium and other metal except sodium and potassium, will irreversibly form insoluble carbonate solid.
I have no idea how natural these red sea salt is.
I'm sure it's not 100% natural as in straight dried ocean water. The elevated mg ca and alk is proof of that. However, it is produced from ocean water so it is considered "natural". The other word is "synthetic", which is what Instant Ocean Reef Crystals is.