I have used several different salts over the last few years Hw Marine Mix, Hw Reefer, Coral Life, Tropic Marin Pro, Reef Crystals, IO Oceanic 50/50 mix, IO. The only salt I really saw a difference with the The Pro Reef, it is outstanding! I gave me great grown and color plus I hardly ever needed to dose anything. I currently use Reef Crystal because it is cheap, good quality, high mag alk and ca than IO, and I cant get Pro Reef locally any more. If I do find it I dont need salt at the time and it is over $100 for a bucket. Reef Crystals is around $50-60. If you can get Pro Reef use it.