This appears to be a great, informative forum with knowledgeable people, so thanks for having it.
I am a fan of both Himalayan and Dead Sea salts. I've used both in my hot tub for a year and believe they feel better than regular pool salt. Both help my psoriasis and my wife's osteoarthritis, which regular pool salt did not.
My experience is that Himalayan salts keep the spa in balance perfectly. I test it twice a week and almost never have to adjust pH or other levels. With Dead Sea, I had to adjust about every 2 weeks. With Bromine, I had to do something ever week and it sometimes got out of whack. With salts never.
So, we am buying a home with an inground pool (gunite) and will covert it to salt water. While I have had zero problems with staining in the hot tub (fiberglass), I wonder if anyone has knowledge or experience with either of those staining a pool? There are 5 minerals in Dead Sea salt and 60 in Himalayan salt, including copper, silver, iron. Of course the concentrations of most are minute. Iron is more significant.
Sorry for the two measuring methods.
Dead Sea - Magnesium Chloride 45,900 mg/l and Potassium 7800 mg/l and zinc (unknown)
Himalayan Titanium - <0.001 ppm, Iron - 38.9 ppm, Copper - 0.56 ppm, Zinc - 2.38 ppm, Silver, 0.031 ppm.