I've used it in one of my tanks where I was previously using Seachem Reef Salt, and frankly I really don't see what's so impressive about it. I know the D&D salt is produced using a solar evaporation process at the Red Sea and then they enhance some of the parameters (very similar to what Red Sea Salt does), and it tested out for me very similar to the Red Sea Salt major specs such as pH, Ca, Mg, Alk, also.