The refining of the impure salt involve filtration of the water solution and the purification by repeated processes of crystallization/recrystallization.
Salt is a natural mineral found in nature. We don't exactly make it, we just purify it.
salt
we use evaporation
No.
No but you can make Saltwater edible using the Reverse Osmosis Method.
Yes, but frequently this salt must be refined.
The quality of salt refer to the purity of edible or industrial salt.
sea salt
If you think to pure sodium chloride (table salt) this salt is edible.
Salt is refined by the filtration of the water solution and repeated crystallization/recrystallization processes.
Epsom salt is used as laxative but it is not a condiment.
Sea salt is refined to obtain common, edible salt.