Originally Posted by jeffaquarius
A basic knowledge of chemistry would help understand your question. A brief explanation is that (edit: sea water) salt is mainly sodium choloride (NaCl) with a bumch of trace elements. This has been successfully artificially copied and used for aquarium for decades. Synthetic doesn't mean superior but rather produced by just mixing those chemicals. Here is a link which hopefully can enlighten a little bit.
Well this was an interesting read with the end of it where the compilation of statistics boil down to the summary that the Synthetic Sea Salt /SSS provided a non toxic environment for, in this case the development of sea urchin larvae, using SSS would not be detrimental to marine life (loose quote). Scientific study info found here if anyone is interested.
Feature Article: The Toxicity of Synthetic Sea Salts and Natural Seawater to the Development of White Sea Urchin (Lytichinus pictus) Larvae â€” Advanced Aquarist | Aquarist Magazine and Blog
Ok, I feel much better about it now. They studied natural sea water NSW
in the bioassay as well as a handful of popular SSS.
I guess I thought the word synthetic meant they didn't use salt or as in "artificial" salt, but after reading a nice definition, it is from human compilation of the separate ingredients ...from dictionary.com definition "2. noting or pertaining to compounds formed through a chemical process by human agency, as opposed to those of natural origin: synthetic vitamins; synthetic fiber."
Thanks for your patience.