I've been using ReefCrystals since about 98.......I've switched several times trying to find that "magic" mix....... :thinking: Oceanic...Seachem.....IO....Tropic Marin Pro, RedSea, Kent, and have always come back to ReefCrystals....I have found of lately very inconsistent batches of salt.....High Ca, low Alk.......Not typical of ReefCrystals.....