Filling up my tank question?

[Stat]

Ok I am fixing to start a 120 Gallon Build. I am going to use RO supply to fill the tank my question is should I add Salt to the 120 tank before filling and fill, mix as i go?, or salt after its full? Should I add a little at a time ?

Anyone got an article or advice on what to do?
Thx in advance
Stat

 

[Kurt_Nelson]

Salt after water, always.

Putting salt in first, and then adding water can cause some really strange chemical imbalances that will precipitate out some of the salts, and they won't redissolve. This holds true any time you mix up saltwater.