About 6 months ago I decided to do an "around the world" salt bar marathon. I used Pink Himalayan, Hawaiian Alaea, Pacific, and Mediterranean. They all turned out really well and about the same in the quality of the soap. I had a bit of trouble with the first batch of Hawaiian Alaea because the grains were a bit to big and scratchy in the shower. These are now at the utility sink in the garage to clean really grimy hands. Other than the size of the grain, I don't have a preference of type of sea salt. If you're considering cost, look for Tone's Sea Salt at Costco or Sam's Club. Good luck with your salt bars!