No.
Yes, but frequently this salt must be refined.
The quality of salt refer to the purity of edible or industrial salt.
Yes, salt can evaporate with pool water. As pool water evaporates, the salt content remains in the pool. When the water evaporates, the salt will be left behind and may accumulate in the pool. Regular testing and monitoring of the pool water chemistry is important to maintain the proper salt levels.
sea salt
simply buy the required amount of salt for the pool from a pool shop or other salt supplier and and toss it in the water.
If you think to pure sodium chloride (table salt) this salt is edible.
Epsom salt is used as laxative but it is not a condiment.
at the pool shop
Sea salt is refined to obtain common, edible salt.
Simply put any pool can be a salt water pool, even an above ground pool.
Add salt
NaCl is commonly known as table salt - Na=Sodium Cl=Chloride