according to their website ...if its not aqua craft its not good ...and they have apparently backed that up with tests but the also say use should use some "hydro-safe" to mix there salt with TAP water! im wondering because one of the LFS swears by it and thats what they sell in their pre-mixed and the only brand they offer for salt ...so i was considering using it instead of IO in know alot of you use IO but im wondering if you have any experience with aqua craft