Grey sea salt
I have been using a Neti Pot for over 15 years. The Baraka salt is the only fault I have ever used that has not caused me to have a stinging or burning sensation in my sinuses. I find that it is an effective rinse and clears me of a tremendous amount of junk every time I use my neti pot. I have been using Baraka salt now for two years, I won't use any other.
I have been using the Baraka salt in my neti pot nightly for over 5 years. In those 5 years, I have had exactly one cold. ONE! In 5 years! I cannot overstate how grateful I am to have been introduced to neti. I tried several natural salts specifically intended for use in a neti pot, but Baraka is the only one that never stings. I use a 1 liter copper pot with one teaspoon of salt. About a half a liter in each nostril. Winter is coming; get rinsing and maybe save yourself from a miserable cold this year!