Definitely need to check out the EAV B-Ionic system.  It’s not exactly what I would call “easy”, compared to traditional dump-and-stir salt, but it has a lot going for it, especially how  fast it is ready to move to your tank.  
I mixed some up the other night, and it was clear in a very short period of time.  Plus, since all of the components are separate, you can control individual parameters.  I was able to make a batch at 1.026 SG, but without tasing Mg, Ca, etc. levels.  
Check out the videos over at BRS.  It’s pretty interesting stuff!!