MgCl NaCl, CaCl, Na-Bicarbonate, and KCl can be all found in sea water and therefore in sea salt, which means that this salt appears similar to sea salt, but it is obviously not natural sea salt because the description of this HydraSense salt says:
The pre-measured and ready-to-mix salt packets contain: calcium chloride, magnesium chloride, potassium chloride, sodium bicarbonate and sodium chloride. Ingredients are not naturally sourced.
From this it's not clear if even NaCl itself is artificially produced or maybe they used sea or rock salt, purified it and added the mentioned ingredients.
I've found 4 reviews, all of which say that nasal irrigation with Neti-Pot may be useful for chronic sinusitis and some other conditions in the upper respiratory tract without any significant side effects:
- American Family Physician, 2009
- PeerJ, 2019
- International Journal of Environmental Research and Public Health, 2017
- Cochrane, 2016
I have found no convincing evidence to say that certain "special" salt, which can be expensive, is better than table salt.
Anyway, on Family Practice Notebook they say it's better to use non-iodized salt, because iodine can affect the function of small hair (cilia) in the respiratory tract.
So, the safest salt appears to be the one that is as pure NaCl as possible (99.9% NaCl, pharmaceutical grade, non-iodized without anti-caking agent calcium silicate) and used to make an isotonic saline solution, which is 0.9% (9 g NaCl in 1 liter of water), so not regular table salt, but also maybe not one of those commercial neti-pot salts with essential oils, etc.