Correct way to mix salt to RO?

I think the ph of really fresh saltwater is a little off until the batch gets aerated. You might see it change on its own if you test it right away and then 30 min later. No need to buffer.

As to how sg works, the sg is like the weight of the water.
This may be interesting (or not lol) http://www.advancedaquarist.com/2002/1/chemistry
To raise the tank sg, def easiest to top of with salt water. Idk if I'd bother buying sw that is only 1.02, might as well just make your own.

ETA on the salt I'm think more about the hassle of mixing and testing than the price. If you are going to all of the trouble of raising the sg, it makes sense to me to start with pure water that you know is 0 tds. Your lfs sounds kinda dumb about water, for all you know they haven't changed the rodi filters in a while. If you were getting fresh water from them to add salt to at home, you could just whip out your tds meter in the store and not buy anything that isn't zero. Since you can't do that on salted water, the salt could be hiding all kinds of garbage.
 
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